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16 September, 15:27

a 7.3kg gallon paint can is lifted 1.78 meters vertically to a shelf. what is the change potential energy of the paint can

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  1. 16 September, 15:33
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    127.5 J

    Explanation:

    Potential energy is given as the product of mass of an object, the height moved and acceleration due to gravity. Therefore, PE=mgh

    The change in potential energy is given by mg (hf-hi) where hf-hi is change in height got by subtracting initial height from final height. In this case, the initial height is zero while final height is 1.78 m.

    Substituting 9.81 m/s2 for g, 7.3 kg for m and h with 1.78 then the change in potential energy will be

    7.3*9.81 * (1.78-0) = 127.47114 J

    Rounded off as 127.5 J
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