Answer to Question #3707 in Mechanics | Relativity for marisa

Question #3707
A bullet of mass 0.0600 kg is fired into a block of wood. <br>If the bullet is moving at 330 m/s as it enters the block and takes 0.15 s to stop, find the average force required to stop the bullet and the impulse exerted by the wood on the bullet.
1
Expert's answer
2011-07-27T09:31:17-0400
m=0.06 kg
v=330 m/s
t=0.15 s
Average force is:
Fa=δp/δt
Impulse of the bullet is
pb = m × δv = 0.06 kg × 330 m/s = 19.8 N×s
Thus
Fa = pb/δt = (19.8 N×s)/(0.15 s) = 132 N
The impulse exerted by the wood on the bullet is the exact initial impulse of the bullet.

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