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A body of mass 20kg is initially at a height of 3m above the ground. It is lifted to a height of 2m from that position. Its increase in potential energy is |
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Answer» Mass, m = 20kg Height m, H = 3m Potential Energy, (PE1) = mgH PE1 = 20 x 9.8 x 3 PE1 = 588 joules Now Height (h) is 5m (3m + 2m) (PE2) = mgh (PE2) = 20 x 9.8 x 5 (PE2) = 980 Joules Increase in Potential Energy = PE2 - PE1 = 980 - 588 = 392 joules |
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