A 20-g bullet moving at 1 000 m/s is fired through a one-kg block of wood emerging at a speed of 100 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)9.7 kJ
C)-9.7 kJ
D)-18 J

Question

Quizplus · Accepted Answer

The initial kinetic energy of the bullet is 10,000 J, and the final kinetic energy is 100 J. The block's initial kinetic energy is 0 J, and its final kinetic energy can be calculated using its velocity after the collision. The change in kinetic energy is negative, indicating a loss of energy.

A 20-G Bullet Moving at 1 000 M/s Is Fired