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Q.

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

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a

750 W

b

1050 W

c

1150 W

d

1250 W

answer is D.

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Detailed Solution

initial velocity u= 10ms-1 ,final velocity v= 20ms-1Work done = Increase in kinetic energyWork =12mv2-u2=  12x500[202−102] =  500×30×102 Powere = ∆KETimePower =  500×30×102×60 = 1250W
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A 500kg car ,moving with a velocity of 36kmh-1 on a straight road undirectionally, doubles its velocity in 1min. The average power delivered by the engine for doubling the velocity is