Question

question 18
a volleyball is bumped upwards. where is its vertical acceleration the greatest? ignore air resistance.
o at its highest point
o vertical acceleration does not change while it is in the air
o as it moves up
o as it moves down

Explanation:

Step1: Identify the force acting on the volleyball

When air - resistance is ignored, the only force acting on the volleyball is the gravitational force $F = mg$. According to Newton's second - law $F=ma$, the acceleration $a = g$ (where $g\approx9.8\ m/s^{2}$) and is constant near the Earth's surface.

Step2: Analyze the acceleration at different positions

Whether the volleyball is moving up, at its highest point, or moving down, the gravitational force acting on it remains the same in magnitude and direction (downwards). So the vertical acceleration $a = g$ does not change while it is in the air.

Answer:

vertical acceleration does not change while it is in the air