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March 27, 2017

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a mass 3 kg is dropped from a 20m high stand how long does it take to reach the ground?

  • physics - ,

    neglecting air friction it does not matter what the mass might be
    a = -9.8

    h = Ho + Vi t - (1/2)(9.8) t^2

    0 = 20 + 0 - 4.9 t^2
    t = sqrt (20/4.9) about 2 seconds

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