Homework Help: Physics

Posted by Abbey on Sunday, October 11, 2009 at 3:32pm.

A bullet with mass 0.40 kg is fired with an initial velocity of 400 m/s from a gun with mass 5.0 kg. The speed of the reoil of the gun is?

Do I have to 0.40 and 5.0 an then divide that by 400?

Physics - drwls, Sunday, October 11, 2009 at 3:48pm
No. The bullet's momentum (0.40)x400 equals the recoiling gun's momentum (in the opposite direction.

That makes the recoil velocity 0.40*400/5.0

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