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Question

To what height should a box of mass 150 kg be lifted, so that its potential energy may become 7350 joules ? (g = 9.8 m/s2).


Solution

P.E= 7350 
M=150 
G=9.8 
H=? 
so, 
P.E= mgh 
7350=150 ×9.8 ×
7350150×9.8=h 
h = 5 m

hence,height is 5 m

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