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An object of mass m is tied to a string of length l and a variable force F is applied on it which brings the string gradually to angle θ with the vertical. Find the work done by the force F. ( Assume initial and final kinetic energy to be zero)

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An object of mass m is tied to a string of length l and a variable force F is applied on it which brings the string gradually to angle θ with the vertical. Find the work done by the force F. ( Assume initial and final kinetic energy to be zero)




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