The law of conservation of energy states that the total energy of an isolated system cannot change it is said to be that energy conserved over time. Energy can be neither created nor destroyed.
mgh = 1/2 mv^2

m=mass of the object
g=acceleration due to gravity
h=height from where the object falls
v=final velocity of the object falling from certain height h
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Energy can neither be created nor be destroyed if one form one energy disappear it appears in another form. mgh=1\2mv^2.
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