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12 November, 16:22

A 79-kg worker at the Burj Khalifa, the tallest building in the world with its roof 828 m above the ground below, rides a series of elevators from the ground level to the roof. What is the worker's change in gravitational potential energy?

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  1. 12 November, 16:46
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    Worker's change in gravitational potential energy = 641.69 kJ

    Explanation:

    Potential energy = Mass x Acceleration due to gravity x Height

    PE = mgh

    Mass, m = 79 kg

    Acceleration due to gravity, g = 9.81 m/s²

    Height, h = 828 m

    Potential energy, PE = 79 x 9.81 x 828 = 641691.72 J = 641.69 kJ

    Worker's change in gravitational potential energy = 641.69 kJ
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