On a straight road, the speed of a car is 15m / s, and it starts to brake at a certain moment. Under the action of resistance, the car moves at an acceleration of 2m / S2. How far is the last car from the starting braking point after 10s of braking?

Let the time from braking to stopping be t0. Then v = V0 + at0 = 0: t0 = − v0a = 152 = 7.5S, the vehicle stops 7.5S after braking. Then the displacement within 10s after braking is equal to the displacement within 7.5S, the size is: x = v0t02 = 15 × 7.52M = 56.25m. A: the distance between the last vehicle and the starting braking point is 56.25m

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