Speed and accelaration

A red train travelling at 72 km/h and a green train travelling at 144 km/h arc headed toward each other along a straight, level track. When they are 950 m apart, each engineer sees the other”s train and applies the brakes. The brakes slow each train at the rate of 1.0 m/s2. Is there a collision? If so, answer yes and give the speed of the red train and the speed of the green train at impact, respectively. If not, answer no and give the separation between the trains when they stop.

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