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I need help with my 9th grade physics homework. This question is about for forces.

Anonymous
timer Asked: Feb 14th, 2015
Question description

If the rifle is stopped by the hunter’s shoulder in a distance of 3.16 cm, what is the magnitude of the average force exerted on the shoulder by the rifle? 
Answer in units of N. 
mass of bullet= 0.0137 kg 
velocity of bullet= 546 m/s to the right 
mass of rifle= 3.82 kg 
recoil speed of the rifle as the bullet leaves the rifle= 1.958167539 m/s

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