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20 November, 22:54

A 4.00 kg stone is dropped from a height of 145 m. What is the stone's potential and kinetic energy respectively when it is 50.0 m from the ground?

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  1. 21 November, 01:59
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    Answer;

    D - 1,960 J, 3,720 J

    Explanation; The stone is initially at a height of 100 m from where it is dropped. The gravitational potential energy of an object with mass m at a height h from the ground is PE = mgh where g is the acceleration due to gravity. At a height of 145 m from the ground, the potential energy of the 3 kg stone is 4*9.8*145 = 5,684 J, approximately; 5680 Joules.

    At a height of 50 m from the ground, the potential energy will be;

    = 4 * 9.8 * 50

    = 1960 Joules

    This means that some of the energy possessed by the stone at a height of 145 m was converted to kinetic energy.

    Therefore; the energy that was converted to kinetic energy will be;

    = 5,680 J - 1960 J

    = 3,724 Joules

    Approximately kinetic energy is 3,720 Joules

    Therefore;

    The Potential energy is 1960 Joules and Kinetic energy is 3,720 Joules
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