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A sphere of mass m is tied to end of a s...

A sphere of mass m is tied to end of a string of length l and rotated through the other end along a horizontal circular path with speed v . The work done in full horizontal circle is

A

0

B

`((mv^2)/l)2pir`

C

`mg(2pir)`

D

`((mv^2)/r)(l)`

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The correct Answer is:
A
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