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4 June, 14:02

A man climbs a wall that has a height of 8.4 meters and gains a potential energy of 4,620 joules. His mass is about ___ kilograms.

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  1. 4 June, 14:06
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    Pot energy = mgh.

    4620=m x10 x 8.4 (9.81->10)

    m = 4620/10x8.4

    m=462/8.4

    m=462/8

    m=231/4

    about 6kg, though a shade less?
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