Resistance force and work (1 Viewer)

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A 70 kg diver steps off a 10m tower and drops straight down into the water. If he comes to rest 5m below the surface determine the average resistance force exerted on him by the water.


I can determine that the PE should be 10290 J. But I'm stuck for what exactly to do next... Since there's no velocity given I am lost.
 

verty

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F = ma, find his deceleration.
 

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