A sphere of mass m is tied to end of a string of length l androtated through the other end along a

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
[CPMT 1993; JIPMER 2000]
(a) 0 (b) l
l
mv
. 2
2
  

 


(c) mg . 2l (d) . ( )
2
l
l
mv