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August 22, 2014

Homework Help: Physics

Posted by June on Friday, February 5, 2010 at 6:58pm.

A rifle has a mass of 4.73 kg and it fires a bullet of mass 13.6 g at a muzzle speed of 829 m/s. What is the recoil speed of the rifle as the bullet leaves the gun barrel?

So far, I've got (using p for momentum) p=p, so massXchange in velocity of the bullet will will equal the massXchange in velocity of the rifle. So my work looks like:
.136kg x 829m/s = 4.73kg x v

Which gives me 23.8m/s, which is incorrect. What am I doing wrong?

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