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6 June, 19:51

A ball is dropped from the top of a cliff. By the time it reaches the ground, all the energy in its gravitational potential energy store has been transferred into its kinetic energy store. If the ball is travelling at 20 m/s when it hits the ground, what height was it dropped from? (Assume that the gravitational field strength is 10 N/kg.)

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Answers (2)
  1. 6 June, 19:56
    0
    20 meters.

    Explanation:

    mgh = 1/2mv^2

    gh = 1/2v^2

    10 (h) = 1/2 (20) ^2

    10h = 1/2 (400)

    10h = 200

    (10h) / 10 = 200/10

    h = 20
  2. 6 June, 22:08
    0
    20 meters
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