Question

how much work should be done on a body of mass 20 kg increase its speed from 2 metre per second to 40 m per second?

Answer 1

Work done is also equal to 1/2mv2
So, in case 1
W=1/2*20*2*2=40J
In case 2
W=1/2*20*40*40=16000J
So the work done is 16000-40=15960J
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