Question

What is the work done to increase the velocity of a car from 18 km per hour to 90 km per hour if the mass of the car is 2000 kg What is the work to be done to increase the velocity of a car from 18 km per hour to 90 km per hour if the mass of the car is 2000 kg

Answer 1

work done by car = change in kinetic energy

= 1/2 mv^2 - 1/2 mu^2

= 1/2 * 2000 * 90 - 1/2 * 2000 * 18

= 90000 - 18000

=72000