Answer:
B. only its velocity
Explanation:
Only the velocity of the object had to change during the time the object reversed its direction.
The speed of an object is the amount of distance covered by the object within a specified time. The speed of an object is considered a scalar quantity because it has magnitude but no direction.
The velocity of an object is the speed of the object in a specific direction. It is a vector quantity because it has both magnitude and direction.
Hence, an object that speeds +4 m/s and then turn around to move -4 m/s has the same speed which is 4 m/s. However, the direction has changed from + to -, therefore, the velocity has changed from +4 m/s to -4 m/s.
The correct option is B.
