A car is traveling at a speed of 20 m/s and has a mass of 1000 kg. If the brakes apply a constant force of 5000 N, calculate the work done by the brakes when the car comes to a stop. Show your working Explain your answer using Energy transfer and braking and braking.

The work done by the brakes is 100,000 J (or 100 kJ). This is calculated using the formula W = F x s, where the force is 5000 N and the distance is 20 m, which is derived from the initial speed and the braking force.

A strong answer should address interpret simple data about braking force, distance and energy transfer directly. Use the context of Energy transfer and braking within Work done and energy transfer, then state the relevant forces or motion reasoning with units where needed. The answer is correct when it names the key physics quantity, keeps distance and displacement distinct, and links the conclusion back to the approved learning objective.