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8 October, 19:10

A twig from a tree drops from a 200m high cliff on to a beach below. during its fall 40% twig's energy is converted into thermal energy. what is the speed with which the twig hits the beach?

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  1. 8 October, 20:42
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    Calculating for potential energy P. E=mgh

    m=mass

    g=acceleration due to gravity

    h=height

    Let the twig's mass be M

    therefore at the start, the twig has 200*9.8*M potential energy.

    During its fall 40% twig's energy is converted into thermal energy and the remaining 60% of this will turn into kinetic energy during the fall, giving us 1176M

    Now the equation for kinetic energy, K. E is 0.5*m*v^2

    m is mass

    v is velocity

    Therefore 1176M=0.5*M*v^2 (mass will divide out)

    velocity is 48.49 m/s
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