When tossing a ball upward with downward as the positive direction, the velocity is negative while ascending, and the acceleration remains positive due to gravity. At the peak of the toss, the velocity is zero, but acceleration is still positive, indicating the influence of gravity. As the ball falls, both the velocity and acceleration become positive after passing the origin. The displacement starts negative during ascent and becomes positive after the ball descends past the starting point. Gravity consistently accelerates the ball throughout its motion, ensuring that acceleration cannot be zero during the fall.
