Physics

The direction of the acceleration of the baseball when it is thrown up into the air is downward.

Acceleration is defined as the rate of change of velocity. When the baseball is thrown up into the air, its initial velocity is upward. However, as the ball moves against the force of gravity, its velocity decreases until it reaches its highest point. At this point, the velocity becomes zero for an instant before the ball starts descending.

During the entire upward ...