A bullet of mass m traveling horizontally at a very high speed v embeds itself in a block of mass M that is sitting at rest on a nearly frictionless surface. (a) What is the speed of the block after...

A bullet of mass m traveling horizontally at a very high speed v embeds itself in a block of mass M 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. Compare the two results and explain

why there is a difference.