what work is said to be done to increase the velocity of a car from 15 km per hour to 30 km per hour if the mass of the car is 1000 kg
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rate of change of momentum = Force=mv2–mv1/time {given,time is one hour,i.e. t=1}
=m(v2–v1)
work=Force × velocity
=m(v2–v1)×v2
=1000(30-15)×30
=1000×15×30
=450Kj .Ans
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I'm busy bro I will try after wards
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