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A is a guess.On a particular railway, a train driver applies the brake of the train at a yellow signal, a distance of
1.0km from a red signal, where it stops.
The maximum deceleration of the train is 0.2ms–2
.
Assuming uniform deceleration, what is the maximum safe speed of the train at the yellow signal?
A 20ms–1 B 40ms–1 C 200ms–1 D 400ms–1