find the ratio of the final kinetic energies of the bullet and rifle.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter7: Conservation Of Energy
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A marksman holds a 3.00 kg rifle loosely, so that we can ignore any horizontal external forces acting on the rifle–bullet system. He fires a bullet of mass 5.00 g horizontally with a speed vbullet=300m/s.

The same rifle fires a bullet with mass 10.5 g at the same speed as before. For the same idealized model, find the ratio of the final kinetic energies of the bullet and rifle.

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