2. An object thrown at a certain angle to the ground moves in a<br />curved path and falls back to the ground. The initial and the<br />final points of the path of the object lie on the same horizontal<br />line. What is the work done by the force of gravity on the object.
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Work done by the force of gravity on the object is equal to the negative of the change of potential energy of the object.
W
g
=−ΔP.E
W
g
=−(mgh
2
−mgh
1
) OR W
g
=−mg(h
2
−h
1
)
But as the object lies on the same horizontal line of the ground i.e h
1
=h
2
=0
⟹W
g
=0
Thus work done by gravity force on the object is zero.
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