A mass m=2 kilogram that has a speed of 5.0 meter per second passes through a metal film of thickness 0.010 meter and emerges with a speed of 2.0 meter per second.
a) Find the kinetic energy of the mass before entering film?
b) Find the kinetic energy of the mass after exiting film?
c) Determine how much work is done by friction during its motion through the film?