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22 July, 16:33

A ball rolls horizontally off a table of height 0.6 m with a speed of 9 m/s. How long does it take the ball to reach the ground?

A. 0.067 s

B. 0.35 s

C. 1.2 s

D. 15 s

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Answers (1)
  1. 22 July, 16:46
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    Answer: 0.067 s

    Explanation:s = Ut + 1/2at^2

    0.6 = 9t + 0.5 * 10 * t^2

    Where a = g = 10m/s/s

    Solving the quadratic equation

    5t^2 + 9t - 0.6=0,

    t = 0.067 s and - 1.7 s

    Of which 0.067 s is a valid time
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