Posted by joey on Thursday, December 9, 2010 at 3:22pm.
The momentum of the bullet: massbullet*velocity
that has to equal the momentum of the block and bullet combination at impact(mblock+massbullet)V set them equal, and solve for V.
Now, the initialKE of the block and bullet combination is 1/2 (totalmass)V^2
set that equal to the change in PEnergy
totalmass*g*height.
solve for height in terms of initial bullet velocity.
WEll, you know height, so you can solve for bullet velocity.
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