(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 10-g bullet moving at 1000 m/s strikes and passes through a 2.0 kg block initially at rest as shown in the diagram. The bullet emerges from the block with a speed of 400 m/s.

[PLAIN]http://img34.imageshack.us/img34/554/82265240.gif [Broken]

To what maximum height will the block rise above its initial position?

3. The attempt at a solution

It's not aperfectly inelesticcollision since the bullet doesn't embed in the block. Therefore this is aninelasticcollision. During the collision some momentum is conserved so,

Momentum just before = momentum just after

And I think:

Kenetic energy just after the collision = final potential energy

[tex]\frac{1}{2} 0.01 (1000)^2 = 2 (9.81) h[/tex]

[tex]h=253.5[/tex]

But this is FAR larger than the actual answer. What's wrong??

This is not a homework problem, just revision for my exam. So any help with this is really appreciated.

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# Inelastic Collision

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