Question

A 1500kg car accelerates from 50km/h to 75km/h. How much work was done?

Answer 1

Work done, W = 181238.4 J

Step-by-step explanation:

We have,

Mass of a car, m = 1500 kg

Initial speed, u = 50 km/h = 13.88 m/s

Final speed, v = 75 km/h = 20.84 m/s

Let W is the work done. It is equal to the change in kinetic energy of the car. So,

`W=(1)/(2)m(v^2-u^2)\\\\W=(1)/(2)* 1500* ((20.84)^2-(13.88)^2)\\\\W=181238.4\ J`

So, 181238.4 J of work was done by the car.