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The decrease in potential energy of a ball of mass 20kg, which falls from a height of 50cm, is?

(a) 968J

(b) 98J

(c) 1980J

(d) 450J

1 Answer

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Best answer
Right answer is (b) 98J

Explanation: U = mgh

U = 20×9.8×0.50 = 98J.

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