Potential energy of suitcase of mass 24kg when taken to the roof of a multistorey building is 7200 J.find the height of the roof above the ground level.given that g=10m/s2.if height of each of the building be 3m, estimate the number of storeys in the building
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potential energy = 7200joule
mgh = 7200
h = 7200/240 = 30m
no of storeys = 30/3 = 10 stores
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