Question

A 1200.0kg car speeds up from 16.0 m/s to 20.0 m/s. How much work was done on the car to increase its speed?

Answer 1

Answer:

9600 Joules

Explanation:

Mass of the car = 1200kg.

Change in speed = final speed - initial speed

= 20 - 16

= 4m/s

Work done on the car to increase its speed = Change in its Kinetic energy

= 1/2 × mass × (change in speed)^2

= 1/2 × 1200 × 4^2

= 1/2 × 1200 × 16

= 600 × 16

= 9600 Joules