Question

if potential energy of an object dropped from a certain height is 100 J ,then what should be its kinetic energy at the ground ?

Answer 1

due to mechanical energy conservation the energy on ground will be equal to energy on any given height
so kinetic energy on ground=100j
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Answer 2

Due to the law of conservation of mechanical energy,

P.E lost=K.E gained

Therefore, Kinetic energy at the ground will be 100J.