When the car runs at a constant speed V, the acceleration after braking is a, and it moves in a straight line at a constant deceleration, the displacement after T & nbsp; seconds is () A. Vt-at22b. V22ac. - vt + at22d. Cannot be determined

When the car runs at a constant speed V, the acceleration after braking is a, and it moves in a straight line at a constant deceleration, the displacement after T & nbsp; seconds is () A. Vt-at22b. V22ac. - vt + at22d. Cannot be determined

Take the direction of the initial velocity of the car as the positive direction, because a is the magnitude of the acceleration, so the acceleration is taken as - A. according to the displacement time relationship x = v0t + 12at2 and the speed time relationship v = V0 + at, the car parking time t = 0 − V − a = VA can be obtained. According to the motion properties, when t ≤ VA, the car does the uniform deceleration linear motion, and directly uses the displacement formula to calculate the displacement; when t > VA, the car does the uniform deceleration first Because the relationship between T and VA is not given in the title, the specific displacement of the car can not be determined