Question

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 ?
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Answer 1

Given that,Mass of body M=0.5kgPotential energy P.E=100JForce of gravity on 1 kg is 10 NNow, F=mg 10=1×g g=10m/s 2 Now, change in Potential energy =mg(h 2 −h 1 ) =mg(h−0) =mghNow, the height is 100=mgh h= 0.5×10100 h=20mHence, the height of the tower is 20 m