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1 September, 23:37

a. 15 kg ball is dropped from the top of a 150 m building. What is the kinetic energy of the ball when it passes the 16th floor at a height of 63 m?

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  1. 2 September, 00:36
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    Distance convered 150m to 60m above the ground = 150 - 60=87m

    final velocity to cover 87 m as follows:

    v^2 = u^2 + 2gh

    v^2 = 0^2 + 2*9.8**87

    v^2=1705.2

    v = ✓1705.2

    v=41.29 m/s

    kinetic energy of the ball as follows:

    kinetic energy = 1/2mv^2

    E = 1/2*15*41.29^2

    E = 12.8KJ
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