If the acceleration is known to be 2m / S2, then () A. The speed of an object at the end of a certain one second must be twice as fast as that at the beginning of that second. B. the speed of an object at the end of a certain one second must be 2m / SC higher than that at the beginning of that second. The speed of an object at the beginning of a certain one second must be 2m / SD higher than that at the end of the previous second. The speed increase of an object per second is 2m / s

If the acceleration is known to be 2m / S2, then () A. The speed of an object at the end of a certain one second must be twice as fast as that at the beginning of that second. B. the speed of an object at the end of a certain one second must be 2m / SC higher than that at the beginning of that second. The speed of an object at the beginning of a certain one second must be 2m / SD higher than that at the end of the previous second. The speed increase of an object per second is 2m / s

A. From a = △ V △ T, v = V0 + at, from the question, a = 2m / S2, t = 1s, from mathematical knowledge, v-v0 = 2m / s, and V is not necessarily 2 times of v0. So a is wrong; B, from the above analysis, v-v0 = 2m / s, then the speed of the object at the end of a second must be 2m / s greater than that at the beginning of the second