A 46 -g bullet leaves the muzzle of a rifle with a speed of, Ask an Expert

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A 4.6 -g bullet leaves the muzzle of a rifle with a speed of 300 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.78-m-long barrel of a rifle?

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A high driver of mass 65.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting at rest. If her downward motion is stopped 2.20 s after her feet first touch the water, what average upward force did the water exert on her?

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