A body of mass 50 kg is raised to a height of 3 m. What is its potential energy? its fimula is an ideal system
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20. yryyrgrvrgevgefecce
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PE = mgh
= 50 x 10 x 3 = 1500 J
Since KE is zero at that height hence mechanical energy of object at 3 m height
= 1500 J
At half the height, i.e. 1.5 m, potential energy can be calculated as follows.
PE = mgh
= 50 x 10 x 1.5 = 750 J
At this stage also the mechanical energy would be 1500
Hence, KE = Mechanical Energy – Potential Energy = 1500 J –750 J = 750 J
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