A bullet of mass 0.018 kg traveling horizontally at a high speed of 290 m/s embeds itself in a block of mass 4 kg that is sitting at rest on a nearly frictionless surface.
(a) What is the speed of the block after the bullet embeds itself in the block?
(b) Calculate the total translational kinetic energy before and after the collision.
(c) Compare the two results and explain why there is a difference.