The initial velocity of a particle moving in a straight line with uniform velocity is 0.5m/s, which is higher in the 9th s than in the 5th s

The initial velocity of a particle moving in a straight line with uniform velocity is 0.5m/s, which is higher in the 9th s than in the 5th s

We can use the successive difference formula (the displacement difference of continuous motion at the same time interval is a constant, this constant is at2, a is the acceleration, t is the same time interval). The displacement in the 9th s and the displacement in the 5th s are the displacement of the 1s time motion, that is, t = 1s, the displacement in the 9th s - the displacement in the 8th s = at2, the displacement in the 8th s - the displacement in the 7th s