an object of mass 35 kg is raised to a height 4 metre above the ground what is the potential energy if the if the object is about to for find its kinetic energy when it is three quarter weight down
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Given :
Mass of the object M=40kg
Height upto which it is raised h=5 m
Potential energy P.E=Mgh
P.E=40×10×5=2000J
Let its kinetic energy be E
k
when it is half way down i.e h
′
=
2
h
According to conservation of energy,
K.E
i
+P.E
i
=K.E
f
+P.E
f
0+2000=E
k
+Mg
2
h
∴ 2000=E
k
+40×10×
2
5
⟹E
k
=1000J
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