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dear harish,
correct option is A.
as in the top position the force of gravity also contribute max.(as no sideway component) to centripital acceleration thus tension has a lower value.
m: MASS OF STONE
Fc: CENTRIFUGAL FORCE
T: TENSION ON THE STRING
IN CASE (A),
T=Fc+mg
IN CASE(B),
T=Fc-mg
IN CASE(C),
T=Fc
HENCE, TENSION WILL BE MINIMUM WHEN STONE IS AT HIGHEST POINT OF ITS PATH!!
tension is minimum at the highest point.
both mg and mv2/r
the correct option is a .at top most point tension becomes zero
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