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A rifle man, who together with his rifle...

A rifle man, who together with his rifle has a mass of `100 kg,` stands on a smooth surface and fires `10` shots horizontally. Each bullet. has a mass `10 g` and a muzzle velocity of `800 m//s`,
a. What velocity does the rifle man acquire at the end of `10` shots?
b. If the shots are fired in `10 s`, what will he the average force exerted on him?
c. Compare his kinetic energy with that of `10` bullets

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