PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A train of mass 2.0×105kg is travelling at 30m/s. The driver applies the brakes so that the speed is reduced to 10m/s while the train moves 600m along the track.
(a) Calculate the work done on the train during the braking.
(b) Using your answer from part (a), find the average force exerted by the brakes on the train. State clearly whether this force acts in the direction of motion or opposite to it.