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What is the change in gravitational pote...

What is the change in gravitational potentia energy of a 50 kg person whon climbs a flight of staris with a height of 3m and a horizontal extent of 5m ?

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The change in gravitational potential energy `= mgh = 50 xx 10 xx 3 = 1500 J`. The horizontal extent of stairs has no effect on the answer.
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