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A motor car needs an engine of 7.5 kilow...

A motor car needs an engine of 7.5 kilowat to keep it moving with a constant velocity of 72 km/h on a rough horizontal road. What is the force of friction between the tyres of the car and the ground?

A

`1.5xx10^(3)N`

B

`375N`

C

`650N`

D

`250N`

Text Solution

Verified by Experts

The correct Answer is:
B
`P=(W)/(t)=(mgh)/(t)`
`therefore t=(mgh)/(P)=(100xx10xx80)/(5xx1000)=16 s`
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