Question

a tennis ball is hit straight upwards and undergoes a free fall motion as it rises towards its highest point. what changes, if any, would be observed of the velocity and the acceleration of the tennis ball as it rises towards its highest point? pick two answers.
the velocity ...
increases
decreases
remains constant
the acceleration ...
increases
decreases
remains constant
tap to select or deselect answers.

Explanation:

For the velocity of the tennis ball as it rises towards its highest point: When an object is in free - fall motion (here, the tennis ball moving upwards and then falling), the acceleration due to gravity acts downwards. As the ball moves upwards, the velocity is in the upward direction, and the acceleration (gravity) is in the opposite direction. So, the velocity of the ball decreases as it moves towards the highest point because the acceleration is opposing the motion.

For the acceleration of the tennis ball as it rises towards its highest point: The acceleration of an object in free - fall near the surface of the Earth is due to gravity, and its value is approximately \(g = 9.8\ m/s^{2}\) (or \(10\ m/s^{2}\) for approximate calculations) and it acts downwards. This acceleration remains constant (neglecting air resistance) throughout the motion of the ball, whether it is moving upwards, at the highest point, or moving downwards.

Answer:

For the velocity: decreases
For the acceleration: remains constant