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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) 2 pir`

C

`mg(2pir)`

D

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

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