A bullet with a mass of 4.0 g and a speed of 712 m/s is fired at a block of wood with a mass of 0.083 kg. The block rests on a frictionless surface, and is thin enough that the bullet passes completely through it. Immediately after the bullet exits the block, the speed of the block is 26 m/s.
(a) What is the speed of the bullet when it exits the block?
(b) Verify your answer by calculating the initial and final kinetic energies of the system.
Ki = J
Kf = J