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A train traveling at 72km/h undergoes at uniform retardation of -2m/s when brake were applied.find the time taken to come rest and the distance travel on the place where brake were apply.

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you want to find t when v=0
72 km/hr * 1000m/km * 1hr/3600s = 20 m/s
v = 20 - 2t
s = 20t - t^2
now find t and s

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