A high diver of mass 650 kg steps off a board 100 m above, Ask an Expert

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A high diver of mass 65.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting from rest. If her downward motion is stopped 1.80 s after her feet first touch the water, what average upward force did the water exert on her? the answer is 1140 N, but how?

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