Question

What is the work to be done to increase the velocity of a car from 30km h–¹ if the mass of the car is 1500kg?​

Answer 1

Explanation:

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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Answer 2

Answer:

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.

Explanation:

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