Q. 11

A body is moving unidirectionally under the influence of a source of constant power supplying energy. Which of the diagrams shown in Fig. 6.5 correctly shows the displacement-time curve for its motion?
A.

B.

C.

D.

Answer :

According to the question, body is moving unidirectionally


under the influence of a source of constant power supplying


energy. We know that,


power=force× velocity


P=F× v


P=ma× v…… (1)


We also know that, v=u+at…. (2)


V=at ( u=0 body starts initially from rest)


From eq (1) and (2)


P=ma× at


P =


… (3)


We also know that,


( u=o)….(4)


From eq (3) and (4)




From the above equation we see that s is directly proportional to


Displacement-time graph is correctly shown by Option (b).

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