A question about sports physics When an object moves in a straight line with constant speed change, it is impossible that () A. The speed change in the first second is less than that in the second second B. The displacement in the first second is less than that in the second C. The average speed in the first second is equal to the average speed in the second second D. The displacement difference in the first and second seconds is equal to the displacement difference in the third and fourth seconds Please explain the reason, thank you

A question about sports physics When an object moves in a straight line with constant speed change, it is impossible that () A. The speed change in the first second is less than that in the second second B. The displacement in the first second is less than that in the second C. The average speed in the first second is equal to the average speed in the second second D. The displacement difference in the first and second seconds is equal to the displacement difference in the third and fourth seconds Please explain the reason, thank you

If you choose a, because it moves at a constant speed, a is constant, that is, the change of speed per unit time is always constant
B. Slow down evenly
C. Uniform deceleration motion, the initial velocity is one, the direction is right, the acceleration is 1, the direction is left
D. This is certain, always equal to at ^ 2