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29 September, 17:17

The third floor of a house is 8m above street level. How much work is needed to move a 136kg refrigerator to the third floor?

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  1. 29 September, 20:15
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    m = Mass of the refrigerator to be moved to third floor = 136 kg

    g = Acceleration due to gravity by earth on the refrigerator being moved = 9.8 m/s²

    h = Height to which the refrigerator is moved = 8 m

    W = Work done in lifting the object

    Work done in lifting the object is same as the gravitational potential energy gained by the refrigerator. hence

    Work done = Gravitation potential energy of refrigerator

    W = m g h

    inserting the values

    W = (136) (9.8) (8)

    W = 10662.4 J
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