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A body is initially at rest. It undergoe...

A body is initially at rest. It undergoes one dimensional motion with constant acceleration. The power delivered to it at time t is proportional to

A

`sqrt(t)`

B

`t`

C

`t^(3//2)`

D

`t^(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
Power = Force `xx` Velocity
`7.5kW=7500W`
In this case, the engine has to do work against the the force of friction at 72 km/hour
`=72xx(5)/(18)=20m//s`
`therefore` Force of friction `=(P)/(V)=(7500 W)/(20)=375 N`
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