A subway train travels between two of its station stops with the acceleration schedule shown in the acceleration vs time graph. Then find out the time interval $Δ t$ during which the train brakes to stop with a deceleration of $1 m / s^{2}$ is (in sec).

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t = 6 s to t = 8 s, a = 1 : Area = 1 × 2 = 2 t = 8 s to t = 10 s, a = 0 : Area = 0 v = 12 + 2 = 14 m / s Deceleration = 1 m / s 2 Δ t = 1 v ​ = 14 s Δ t = 20 s

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