Question

An iron ball of mass 5kg is kept on the roof of 20m high building at a place where g = 10m/s2. The potential energy stored in ball is
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Answer 1

Mass = 5 KG

Height - 20metre

acceleration due to gravity - 10m/s^2

So Potential energy = Mass * g * Height

i.e. 5*10*20 = 1000 Joules