When the car is running at the speed of 8m / s and the acceleration after emergency braking is 6m / S2, what is the displacement within 4S after braking? What is the speed at the end of 4 seconds?

When the time for the vehicle speed to decrease to zero is t0 = 0 − v0a = − 8 − 6S = 43S ＜ 4S, the speed at the end of 4S after braking is zero, and the displacement is x = v02t0 = 82 × 43 = 163m. A: the displacement within 4S after braking is 163m, and the speed at the end of 4S is zero

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