(30 points) An electron is moving in a metal wire under the influence of a frictional force Wa) Fr-bv. The resulting damped motion has the form x ()=x (0) exp (-1/t) where the constant r=10-6 seconds. Take the mass of the electron to be me a) Express the velocity as a function of time. b) Express the acceleration as a function of time. Express the kinetic energy as a function of time. At what time is the kinetic energy reduced to e-10 of its initial value? e) What is the value and units of the friction constant b? 10-30 kg.