What is the work to be done to increase the velocity of a car from 36Km/h to 72Km/h if the mass of the car is 2500Kg?
Answers
Answered by
6
Work Done = The Change in Kinetic Energy
= 1/2mv^2 - 1/2 mu^2
The Mass of car = 1500 kg
Intial Velocity = 36 km/h
= 36 * 5 / 18
= 2 * 5
= 10 m/s
Final Velocity = 72 km/hr
= 72 * 5/18
= 5 * 4
= 20 m/s
Work Done = 1/2 mv^2 - 1/2 mu^2
= 1/2 m(v^2 - u^2)
= 1/2 * 1500 ( 20 * 20 - 10 * 10)
= 750 ( 400 - 100)
= 750 * 300
= 225000 J
Similar questions