Initially spring is relaxed. A person starts pulling the spring by applying a variable force F. Where has the work gone ?

It is stored in the form of thermal energy in spring

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It is stored in the form of potential energy in spring

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It is stored in the form of kinetic energy in spring

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Cannot be determined

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Solution

The correct option is B It is stored in the form of potential energy in spring
We know that the energy possessed by a body due to virtue of its configuration is called the Potential Energy.
On pulling the spring the spring will get deformed which will change the configuration of the spring.
So the work done by the person will get stored in the form of PE in spring.

Hence correct answer is option $B$

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