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प्रश्न
The potential energy of a body of mass 0.5 kg increases by 100 J when it is taken to the top of a tower from ground. If force of gravity on 1 kg is 10 N, what is the height of the tower?
उत्तर
P.E. = Force × height
Potential energy = (m g) h
100 J = (0.5 × 10) N × h
h= `100/(0.5 '10)` = `100/(5/10 '10` =20 m
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