A-LevelPhysicsKinematics9702/12 · Oct/Nov 2016 · Q101 Mark
In order that a train can stop safely, it will always pass a signal showing a yellow light before it reaches a signal showing a red light. Drivers apply the brake at the yellow light and this results in a uniform deceleration to stop exactly at the red light. The distance between the red and yellow lights is x. If the speed of the train is increased by 20%, without changing the deceleration of the train, what must be the minimum distance between the lights?
A1.20 x
B1.25 x
C1.44 x
D1.56 x
✓ Correct answer
C: 1.44 x
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