Question

What is the work to be done to increase the velocity of a car from 30 km
${h}^{ - 1} \: to \: 60km \: {h}^{ - 1} \: if \: the \: mass \: of \: the \: car \: is \: 1500kg$

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Answer 1

Answer:

Initial velocity    u=30 km/h=30×185=325 m/s

Final velocity    v=60 km/h=60×185=350 m/s

Mass   m=1500 kg

Work done   W=21mv2−21mu2

⟹ W=2m(v2−u2)=21500×((350)2−(325)2)=156187 J