What is the work to be done to increase the velocity from 18 km/hr to 36 km/hr if the
mass of the car is 2000 kg?
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What is the work to be done to increase the velocity of a car from 30 km h
−1
to 60 km h
−1
If the mass of the car is 1500 kg?
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Initial velocity u=30 km/h=30×
18
5
=
3
25
m/s
Final velocity v=60 km/h=60×
18
5
=
3
50
m/s
Mass m=1500 kg
Work done W=
2
1
mv
2
−
2
1
mu
2
⟹ W=
2
m
(v
2
−u
2
)=
2
1500
×((
3
50
)
2
−(
3
25
)
2
)=156187 J
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