Physics-
General
Easy
Question
An object of mass 
is tied to a string of length 
and a variable horizontal force is applied on it which starts at zero and gradually increases until the string makes an angel 
with the vertical. Work done by the force 
is
The correct answer is:
or 
(Since, change in kinetic energy is zero)
Here, 
work done by tension = 0
work done by fore of gravity
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