Question

A motor drives a body along a straight line with a constant force. The power P developed by the motor must vary with time t according to

Answer 1

Answer:

D

Explanation:

Force = F = constant  (GIven)

Power = P variable as per time (Given)

Since the force is constant, acceleration will also be constant.

Thus, v = at

as P = F.v = Fat

where power varies linearly with the time.

Since both are constants, thus - P ∝ t

Power is directly proportional to time, hence the graph between power and time will form a straight line. Thus D is the correct option.

Answer 2

Answer:

Directly Proportional=Straight Line graph