A particle of mass 
is tied to one end of a string of length 
and rotated through the other end along a horizontal circular path with speed 
. The work done in half horizontal circle is
A
Zero
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Here, centripetal force,
But the angle between force and displacement is 
because the direction of centripetal force is always towards the center and direction of displacement is always tangential.
Then work done
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