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Question

What is the work done (in KJ) to increase the velocity of a car from 36 kmhr to 90 kmhr? When the weight of the car is 1000kg.


Solution

v2 = 90 *  518 = 25 msec,

v1  = 36 *  518 = 10msec

Work done to increase the velocity will be

= 12 m v12  - 12 m v22

= ( 252 - 10210002

= 500  * (625-100) = 500 * 525 = 262.5 KJ


Physics

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