Final answer:
For an object moving at constant velocity, acceleration is zero while displacement, speed, and time are non-zero. Displacement measures the change in position, speed is the measure of how fast the object is moving, and time is the duration over which the object moves. So the correct answer is Option b.
Step-by-step explanation:
The question concerns a special moving at constant velocity, asking which quantity would be nonzero. For an object moving at a constant velocity, the acceleration is zero because acceleration is defined as the rate at which velocity changes. Since the velocity is constant, there is no change in velocity, and hence, no acceleration. The correct nonzero quantities are displacement, speed, and time. Displacement is the change in position of the object, speed is a scalar measure of how fast the object is moving, and time is the duration of motion.
The rate of change of velocity is called acceleration, which would be zero in the case of constant velocity motion. Moreover, a plot of displacement versus time being linear indicates that acceleration is zero, and the object is in linear motion with a constant velocity.
If we consider a scenario where a one-dimensional motion results in zero distance traveled, such as returning to the starting point, the displacement can be zero because displacement considers the direction of motion. However, the speed and time cannot be zero if there is motion.