Question

a baseball is thrown straight upwards from the ground and undergoes a free fall motion as it rises towards its highest point and then fall back downward to the ground. what changes, if any, would be observed of the velocity and the acceleration of the baseball as it falls downward from its highest point? pick two answers.
the velocity ...
increases
decreases
remains constant
the acceleration ...
increases
decreases
remains constant
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Explanation:

For the velocity of the baseball as it falls downward: When an object is in free fall (neglecting air resistance), the acceleration due to gravity acts downward. So the velocity of the baseball (which is moving downward) will increase because the acceleration is in the direction of motion.

For the acceleration of the baseball as it falls downward: In free - fall motion (near the Earth's surface and neglecting air resistance), the acceleration is due to gravity, \(g\approx9.8\ m/s^{2}\), and it remains constant. The acceleration does not change as the baseball falls (as long as we are in the region where \(g\) is approximately constant).

Answer:

For the velocity question: increases
For the acceleration question: remains constant