A 20-G Bullet Moving at 1000 M/s Is Fired Through

Multiple Choice

A 20-g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s.What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?

A) 0 J
B) −9.5 kJ
C) 9.5 kJ
D) −18 J