A boy of mass 40kg climbs up a 18stairs each of high of 20cm . Calculate the change in potential energy
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Change in potential energy = final potential energy - intial potential energy
ΔP.E. = P.E. (final) -0 [ P.E. intial is zero ]
P.E. FINAL= mgh
= 40×10×20/100×18
= 144 joules
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