What is the work to be done to increase the velocity of a car from 30km/h to 60km/h if the mass of the car is 1500 kg?
Answers
Answered by
8
Answer:
Example 11.4 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? × 1500 kg × (25/3 m s–1)2 = 156250/3 J. The final kinetic energy of the car, Ekf = 1 2 × 1500 kg × (50/3 m s–1)2 = 625000/3 J.
Answered by
3
Answer:
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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