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A small ball of mass m is attached to a ...

A small ball of mass m is attached to a piece of light and released from rest at an angle `phi_(0)=37^(@)` from the verticle as shown which of the graphs best represents the tension in the string as a function of the angle `phi` (also relative to the vertical)?

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The correct Answer is:
B
`T-mg cos phi =(mv)^(2)/R….(1)`
and mgl`(cos phi-cos phi_(0)) = 1//2mv^(2)….(2)`
` T=mg(3cos phi-2cos phi_(0))`
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