physics

A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 4.5 m/s. How much work was done by friction as the child goes down the slide?

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asked by haley
  1. change in potential energy = m g h = 17*9.81*3.5
    = 584 Joules

    Kinetic energy = (1/2)17 (4.5)^2
    = 172 Joules

    The difference was lost to friction on the way down

    584 - 172 = 412 Joules

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    posted by Damon

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