A 2600 kg truck travelling at 72 km/h slams on the brakes and skids to a stop. The frictional force from the road is 8200 N. Use the relationship between kinetic energy and mechanical work to determine the distance it takes for the truck to stop.

Approximately .

Explanation:

Convert the initial speed of this truck to standard units:

.

Calculate the initial kinetic energy of this truck:

.

The kinetic energy of the truck would be when the truck is not moving. Hence, the friction on the truck would need to do of work on the truck to bring the truck to a stop.

Calculate the displacement required to achieve of work at :

.

This result is negative because the direction of friction is opposite to the direction of the motion of the truck.

Hence, the truck would come to a stop after skidding for approximately .

1/0.14nm = 10^10/1.4 a lot