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March 24, 2017

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A 62.7-kg person jumps from rest off a 2.98-m-high tower straight down into the water. Neglect air resistance. She comes to rest 1.09 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This force is nonconservative.

please help :D? i really don't get this question

  • physics - ,

    Calculate speed when body hits water:
    (1/2) m v^2 = m g h
    so
    v = sqrt(2 g h)

    average force = change in momentum /time to stop

    change in momentum = m(v-0)

    time to stop = distance/average speed = 1.09 / (.5 v)

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