Answer :

Let be the force applied by the two friends. The tension in both the side of the rope is equal to the force applied by the friends.

Let be the angle rope makes with the person horizontally.

Vertical equilibrium, ------(1)

Now consider the triangle with the slant rope inside the well.


Theta decreases as man moves up, and as theta decreases . thus for equation (1), tension must increase so that it is equal to R.H.S.

Putting the above in equation (1), we get,

Thus, the force exerted by the friends

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