After braking, the car starts to move in a straight line with uniform deceleration. The distance from starting braking to passing at rest is s. when its speed is reduced to half of the initial speed, the driving distance is s______ ．

Suppose the initial speed is V0, s = 0 − v022a, when its speed is reduced to half of the initial speed, the driving distance s ′ = (V02) 2 − v022a = − 34v022a = 3s4

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