If the displacement in the second second second after braking is 6.25m (the braking time is more than 2S), then (1) what is the acceleration of the vehicle? (2) What is the displacement of vehicle passing through in 6 seconds after braking?

(1) If the instantaneous speed at the middle of the second second second is v = x2t2 = 6.251 = 6.25m/s, the acceleration of the car is a = V − v0t = 6.25 − 101.5 = − 2.5m/s2. The negative sign indicates the direction. (2) if the time of the car speed reducing to zero is t = v0a = 102.5s = 4S, the displacement within 6S is equal to the displacement within 4S, x = v022a = 1005 = 20m The displacement is 20 m

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