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Question

A catapult throws a stone of mass 0.10 kg with a velocity of 30 m/s. If 25% of the PE of the elastic band is wasted during transmission ,find the magnitude of PE.

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Solution

Given
The mass of stone(m)=0.1kg
Velocity of the stone(v)=30m/s
As you know, the kinetic energy of the stone
(KE)=0.5mv2=0.5×0.1×(30)2=45J
The kinetic energy of stone=25
than the potential energyof the catapult
That is ,KE(stone)=75 PE(catapult)
45J=0.75×PE
Therefore,PE=450.75=60J

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