A bullet of mass 1.9 kg is headed at horizontal speed 60 m/s toward a block of m

Question

A bullet of mass 1.9 kg is headed at horizontal speed 60 m/s toward a block of mass 11(1.9 kg) = 20.9 kg resting on a horizontal frictionless surface. The bullet strikes the block and comes to rest relative to the block somewhere deeply embedded inside the block. What average force did the block exert on the bullet if it took 0.1 s to stop the bullet? 1. ?1140 N 2. 1045 N 3. 1140 N 4. Not enough information is provided. 5. ?95 N 6. ?1045 N 7. 95 N 8. Zero, since the bullet comes to rest relative to the block.

Explanation / Answer

m1v1 = (m1+m2)V

V = 5 m/s

F = mdv/dt

= 1045 N

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