A train is moving at 100km/h when the brakes are applied by the engineer, the train stopped in 2 km after the brakes are applied. Assuming that the deceleration of the train is constant.
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u=100
s=2km
v=0
v^2-u^2=2as
0-100×100=2×a×2
-10000/4=-a
a=2500
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