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  4. An object of mass m is tied to a string of length l and a variable horizontal force is applied on it which is initially zero and gradually increases until the string makes an angle θ with the vertical. Workdone by the force F is: <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/6f4743e207033897e4fb03488039e888-.png />

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Q. An object of mass $m$ is tied to a string of length $l$ and a variable horizontal force is applied on it which is initially zero and gradually increases until the string makes an angle $\theta$ with the vertical. Workdone by the force $F$ is:
image

Work, Energy and Power

Solution:

Since there is no change in kinetic energy, work done by the force is equal to change in potential energy.