An electron (m=9.11×10-31 kg) moves in a circle whose radius is 2.00 x 10-2 m. If the force acting on the electron is 4.60×10-14 N, what is its speed?

An electron (m=9.11×10-31 kg) moves in a circle whose radius is 2.00 x 10-2 m. If the force acting on the electron is 4.60×10-14 N, what is its speed?
A block is at rest on the incline shown in the figure. The coefficients of static and kinetic friction are μs = 0.75 and μk = 0.64, respectively. The acceleration of gravity is 9.8 m/s2 . What is the frictional force acting on the 38 kg mass? Answer in units of N