A 1 kg block of wood is at rest on a frictionless icy pond. A 10 gram bullet tra

Question

A 1 kg block of wood is at rest on a frictionless icy pond. A 10 gram bullet traveling horizontally with a speed of 1000 m/s enters the block and then exits the block with a horizontal speed of 900 m/s.

1) What is the change in momentum of the bullet/block system (in kg m/s) during the bullet's penetration of the block?

2) What is the change in momentum of the above block (in kg m/s) during the bullet's penetration?

3) What is the speed of the above block (in m/s) when the bullet exits the block?

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Explanation / Answer

1)change in momentum of bullet= .01*100=1 kg-m/s

loss in momentum in bullet =gain in momentum of block;

so change in momentum of block=1 kg-m/s

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