The driver of a moving car applied the brakes - Junior Cycle Science - Question b - 2007

To calculate the work done, we can use the formula:

$Work = Force \times Distance$

Here, the average stopping force is 8000 N, and the distance travelled after the brakes were applied is 20 m. Substituting the values:

$Work = 8000 \text{ N} \times 20 \text{ m} = 160000 \text{ J}$

Thus, the work done in stopping the car is 160,000 J.