For an object moving in a straight line with uniform acceleration, the initial velocity VO = 2.0 M / s, and the displacement passing through in the third second is 4.5 m, what is its acceleration? Physics in senior one

For an object moving in a straight line with uniform acceleration, the initial velocity VO = 2.0 M / s, and the displacement passing through in the third second is 4.5 m, what is its acceleration? Physics in senior one

Let the acceleration be a, then the initial velocity in the third second is V1 = 2 + 2a, the final velocity in the third second is V2 = 2 + 3a, the time in the third second is t = 1s, the average velocity in the third second is v = (V1 + V2) / 2 = (4 + 5a) / 2, and the displacement in the third second is s = V * t = 4.5m, then the acceleration a = 1m / S ^ 2 can be obtained