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
