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20 August, 02:17

The work w0 accelerates a car from 0 to 50 km/hr. how much work is needed to accelerate the car from 50 km/hr to 150 km/hr?

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  1. 20 August, 04:00
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    KE reqd to move from 0 to 50 will be proportional to 50X50 or 2500. This is equal to W.

    To change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. This corresponds to 8W.

    Best answer is a). Work reqd is prop to velocity squared.
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