The string of pendulum of length l is displaced through 90 degree from the vertical and released .Then the minimum strength of the string in order to withstand the tension as the pendulum passes through the mean position is

Dear pallavi

when pendulam is reliesed them decrese in potential energy will increase the kinetic energy

energy balance

 mg(l/2)  = mv²/2

 v²= gl ..........1

now at lower most position centrifugal force as well as weight both acting in downward direction which is balance by tension in string

so T = mg + mv²/(l/2)

       = mg + 2mg

         =3mg

        

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