In a police ballistics test,a 10.0-g bullet moving at 300 m/s is fired into a 1.00-kg block at rest.The bullet goes through the block almost instantaneously and emerges with 50.0% of its original speed.What is the speed of the block just after the bullet emerges?
A)1.50 m/s
B)2.97 m/s
C)3.00 m/s
D)273 m/s

Question

Quizplus · Accepted Answer

Momentum is conserved:$$(0.0100	ext{ kg})(300	ext{ m/s})=(0.0100	ext{ kg})(v_b)+(1.00	ext{ kg})v_b$$$$v_b=\boxed{1.50	ext{ m/s}}$$

In a Police Ballistics Test,a 10