4) a) A body at rest is acted upon by a force ‘F, such that it acquires a velocity'v, while moving with an acceleration ‘a'. Show that the work done by the force F, on the body is given by ). b) How can you determine the amount of work done by a variable force by graphical method ? c) Establish the relation between eV and J.
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Hint: As the work done by the body is asked, let us figure out the total force acting on the body and total energy of the system.
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