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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 and along a horizontal circular path with speed v. The work done in full horizontal circle is :

A

zero

B

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

C

`mg xx 2pi l`

D

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

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The correct Answer is:
A
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