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?
Solution:Mass of the car, m =1500 kg, initial velocity of car, u = 30 km h–1= 30 × 1000m / 60 × 60s= 25/3 m s–1.Similarly, the final velocity of the car,v = 60 km h–1 = 50/3 m s–1.Therefore, the initial kinetic energy of the car,K Ei = 1/2 m u2 = 1/2× 1500 …