Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A:

Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A:
Question 22 options:
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1)
it has the same position and the same velocity as A.
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2)
it has the same position and the same acceleration as A.
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3)
it has the same velocity and the same acceleration as A.
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4)
it has the same displacement and the same velocity as A.
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5)
it has the same position, displacement and velocity as A.
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Question 23 (1 point)
Question 23 Unsaved
When starting from rest at the bottom of a straight road with constant upward slope, Joan bicycles to the top 50.0 s ahead of Sally, whose travel time is 5.00 minutes. What is the ratio of Joan’s acceleration to Sally’s acceleration?
Question 23 options:
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0.694
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2)
0.833
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3)
1.20
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4)
1.44
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5)
6.0
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Question 24 (1 point)
Question 24 Unsaved
A stone is thrown from the top of a building with an initial velocity of 20 m/s downward. The top of the building is 60 m above the ground. How much time elapses between the instant of release and the instant of impact with the ground?
Question 24 options:
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2.0 s
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2)
6.1 s
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3)
3.5 s
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4)
1.6 s
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5)
1.0 s
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Question 25 (1 point)
Question 25 Unsaved
A particle moving with a constant acceleration has a velocity of 20 cm/s when its position is x = 10 cm. Its position 7.0 s later is x = -30 cm. What is the acceleration of the particle?
Question 25 options:
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1)
-7.3 cm/s2
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2)
-8.9 cm/s2
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3)
-11 cm/s2
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4)
-15 cm/s2
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5)
-13 cm/s2
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Question 26 (1 point)
Question 26 Unsaved
A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
Question 26 options:
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10 m/s; 9.8 m/s2.
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2)
9.0 m/s; 9.8 m/s2.
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3)
9.0 m/s; 9.0 m/s2.
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4)
1.0 m/s; 9.0 m/s2.
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5)
1.0 m/s; 9.8 m/s2.
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Question 27 (1 point)
Question 27 Unsaved
Two identical balls are at rest side by side at the bottom of a hill. Some time after ball A is kicked up the hill, ball B is given a kick up the hill. Ball A is headed downhill when it passes ball B headed up the hill. At the instant when ball A passes ball B,
Question 27 options:
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1)
it has the same position and velocity as ball B.
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2)
it has the same position and acceleration as ball B.
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3)
it has the same velocity and acceleration as ball B.
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4)
it has the same displacement and velocity as ball B.
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5)
it has the same position, displacement and velocity as ball B.
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Question 28 (1 point)
Question 28 Unsaved
An automobile moving along a straight track changes its velocity from 40 m/s to 80 m/s in a distance of 200 m. What is the (constant) acceleration of the vehicle during this time?
Question 28 options:
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1)
8.0 m/s
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2)
9.6 m/s
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3)
12 m/s
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4)
6.9 m/s
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5)
0.20 m/s
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Question 29 (1 point)
Question 29 Unsaved
A juggler throws two balls to the same height so that one is at the halfway point going up when the other is at the halfway point coming down. At that point:
Question 29 options:
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1)
Their velocities and accelerations are equal.
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2)
Their velocities are equal but their accelerations are equal and opposite.
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3)
Their accelerations are equal but their velocities are equal and opposite.
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4)
Their velocities and accelerations are both equal and opposite.
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5)
Their velocities are equal to their accelerations.
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Question 30 (1 point)
Question 30 Unsaved
An electron, starting from rest and moving with a constant acceleration, travels 2.0 cm in 5.0 ms. What is the magnitude of this acceleration?
Question 30 options:
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1)
2.5 km/s2
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2)
0.80 km/s2
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3)
1.6 km/s2
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4)
1.3 km/s2
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5)
3.2 km/s2
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Question 31 (1 point)
Question 31 Unsaved
The position of a particle as it moves along the x axis is given by x = 15e-2t m, where t is in s. What is the acceleration of the particle at t = 1 s?
Question 31 options:
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1)
22 m/s
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2)
60 m/s
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3)
8.1 m/s
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4)
15 m/s
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5)
35 m/s
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Question 32 (1 point)
Question 32 Unsaved
An object is thrown vertically upward such that it has a speed of 25 m/s when it reaches two thirds of its maximum height above the launch point. Determine this maximum height.
Question 32 options:
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1)
64 m
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2)
48 m
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3)
32 m
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4)
96 m
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5)
75 m
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