A girl of 45kg throws a 200g ball from 30m high building at 20m/s speed. Find out the kinetic energy of the ball just before touch the ground
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height = 5m
mass = 200g
potential energy = mgh = 0.2 ∗ 5 ∗ 9.8 = 9.8J
Since potential energy at the highest point is equal to kinetic energy at lowest point , therefore kinetic energy will be 9.8J
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