When the acceleration is 3m / S2, then () A. The end velocity of a second must be 3 times of the initial velocity of that second. B. the initial velocity of a second must be 3 M / s higher than that of the previous second. C. the end velocity of a second must be 3 M / s higher than that of the previous second. D. the end velocity of a second must be 3 M / s higher than that of the previous second

When the acceleration is 3m / S2, then () A. The end velocity of a second must be 3 times of the initial velocity of that second. B. the initial velocity of a second must be 3 M / s higher than that of the previous second. C. the end velocity of a second must be 3 M / s higher than that of the previous second. D. the end velocity of a second must be 3 M / s higher than that of the previous second

A. C. the acceleration of the object is 3m / S2, and the final velocity of the object in any second must be 3m / s greater than the initial velocity, so a is wrong and C is correct; B. the initial time of a second and the last time of the previous second are the same time, so the velocity must be the same, so B is wrong; D. the final time of a second and the first time of the previous second are different by 2S, so the velocity is different by 6m / s, so D is wrong; so C