Solve following examples. 1.Calculate the work done to take an object of mass 40 kg to a height 30m. (G=9.8m/s^2)
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Answer:
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
Explanation:
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