When an object moves in a variable speed linear motion, the velocity is 4 m / s at a certain moment, and the velocity after 2 s is 4 m / s. if the acceleration of the object is constant within 2 s, then the acceleration of the object is constant A / may be equal to 0 B / may be less than 4m / S C / must be 4 m / s D / may be greater than 4m / s

When an object moves in a variable speed linear motion, the velocity is 4 m / s at a certain moment, and the velocity after 2 s is 4 m / s. if the acceleration of the object is constant within 2 s, then the acceleration of the object is constant A / may be equal to 0 B / may be less than 4m / S C / must be 4 m / s D / may be greater than 4m / s

Since the acceleration is constant, then the direction of the speed change is constant. So the speed of the object changes from 4 m / s to 4 m / s in the opposite direction, then the speed changes by 8 m / s, and the time is 2 s, so the acceleration must be equal to 4 m / S ^ 2