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A rifle with a weight of 40 N fires a 4.7-g bullet with a speed of...

A rifle with a weight of 40 N fires a 4.7-g bullet with a speed of 210 m/s.

(a) Find the recoil speed of the rifle. m/s

(b) If an 800-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle. m/s

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