Answer:
C) a = 0
Step-by-step explanation:
Constant velocity means that the object is moving in a straight line with a constant speed. If an object has constant velocity, then its acceleration is zero. This is because acceleration is the rate of change of velocity, so if the velocity is constant, then there is no change in velocity, and therefore no acceleration.
Option A) Delta*x = 0 represents the displacement or change in position of the object, and it could be zero or non-zero depending on the starting and ending position of the object.
Option B) vi=0 represents the initial velocity of the object and it could be zero or non-zero depending on the starting condition of the object.
Option D) v_{f} = 0 represents the final velocity of the object, and it could be zero or non-zero depending on the ending condition of the object.
Therefore, the correct answer is C) a = 0, because constant velocity means that the object is not accelerating.