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A 500-kg car, moving with a velocity of ...

A `500-kg` car, moving with a velocity of `36kmh^-1` on a straight road unidirectionally, doubles its velocity in `1min`. The average power delivered by the engine for doubling the velocity is

A

(a) `750W`

B

(b) `1050W`

C

(c) `1150W`

D

(d) `1250W`

Text Solution

Verified by Experts

The correct Answer is:
D
`u=10ms^-1`, `v=20ms^-1`
Work done=Increase in kinetic energy
`=1/2xx500[20^2-10^2]=(500xx30xx10)/(2)`
`Power=(500xx30xx10)/(2xx60)=1250W`
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