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10 January, 11:28

An 114 kg man climbs up a 1 m high flight of stairs. The acceleration of gravity is 9.81 m/s 2. What is the increase in the gravitational potential energy of the man-earth system? Answer in units of kJ.

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  1. 10 January, 13:20
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    1.118KJ

    Explanation:

    Potential energy is the energy possessed by a body by virtue of its position.

    If the body has a mass (m), and climbs through height (h), the potential energy will be mass*acceleration due to gravity*height

    P. E = mgh

    Given m = 114kg, g = 9.81m/s² h = 1m

    P. E = 114*9.81*1

    P. E = 1,118.34Joules

    P. E = 1.118KJ

    This shows that increase in the gravitational potential energy of the man-earth system is 1.118KJ
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