Energy :: Discussion


4.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
Answer:  Option  B
Explanation:

U = mgh
U = 20×9.8×0.50 = 98J.

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Published by:Michael Daani

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