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March 27, 2017

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7)
An apple falls from a tree (h = 9m). In the absence of air resistance,
how fast is it traveling when it strikes the ground?

  • Science - ,

    potential energy is mgh = m(9.8)(9) = 88.2m where m is the mass of the apple.

    given that there is no air resistance, all of these potential energy is converted to kinetic energy during the fall

    i.e. Ep = Ek

    so, Ek = 1/2mv^2 = Ep

    1/2mv^2 = 88.2m

    v^2 = 88.2m/0.5m ...so you can solve for velocity.

    hope that helps..

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