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Please explain steps: An 80 kg swimmer steps off a platform 10 m above the water...

Please explain steps:

An 80 kg swimmer steps off a platform 10 m above the water and free-falls downward. Once she enters the water, drag forces take over and bring her to rest in 3.0 s (after her feet first

touch water).

(a)Assuming that the drag force is constant, find this force. (b) Find her depth under the water when she comes to rest.

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