A 20.0-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. If the block had been originally at rest and is free to move, what is its resulting speed?
a. 22.0 m/s
b. 18.0 m/s
c. 20.0 m/s
d. 2.00 m/s
e. 45.0 m/s
Question 2
Two particles collide, one of them initially being at rest. Is it possible for both particles to be at rest after the collision?
a. If the collision is perfectly inelastic, then this happens.
b. If the collision is elastic, then this happens.
c. This can happen sometimes if the more massive particle was at rest.
d. No.
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