A body moves from point A to B under the action of a force, varying in magnitude as shown in figure. Obtain the work done. Force is expressed in newton and displacement in metre.

A body moves from point A to B under the action of a force, varying in

1.	A body moves from point A to B under the action of a force, varying in magnitude as shown in figure. Obtain the work done. Force is expressed in newton and displacement in metre.
Answer» Solution :Work done = Area under F - s graph (or) `W_(AB) = W_(AP) + W_(PQ) + W_(QR) + W_(RB)` `= 10 xx 1 + (1)/(2) (10 + 15) xx 1 + (1)/(2) xx 1 xx 15 - (1)/(2) xx 1 xx 15` = 22.5 J