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16 December, 09:05

A hammer is dropped from the roof of a building 1000 meters tall. How long will it

take to hit the ground?

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Answers (1)
  1. 16 December, 11:27
    0
    Let's use the kinematic equation

    s = ut + ½at²

    Where

    s = distance fallen

    u = initial velocity

    t = time taken

    a = acceleration

    Here the hammer is dropped so a = g = gravitational acceleration

    u = 0 because the hammer is dropped.

    So by substituting you get,

    1000 = 0 + ½*10*t²

    t² = 200

    t = 14.14 s
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