Question a high diver of mass 650 kg steps off a board 100, Ask an Expert

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Question: 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 1.90 s after her feet first touch the water,

Part A: What average upward force did the water exert on her?

I need help to find what average upward force the water exerted on her.

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