Question

15. Asim is driving a car. He is going to his office. He increases the velocity of his car from 20km/hr to 40km/hr. The mass of the car is 1000kg. a) What is the initial velocity of the car in m/s. b) Find the final velocity of the car in m/s. c) What is the work done to increase the velocity? d) Find the final kinetic energy of the car.​

Answer 1

Answer : 156187 J

Explanation:

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

I worked it out!