Vo = 40.000m/3600s = 11.11 m/s.
V = Vo + a*t = 0, 11.11 - 0.5t = 0, -0.5t = -11.11, t = 22.22 s.
A train driver moving at 40km|h applies break so that there is a constant retardation of 0.5m|s find time taken before the train stops
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