Question

if you throw a baseball straight up, what is its velocity and acceleration at the highest point?
0 m/s and -9.8 m/s²
9.8 m/s and 0 m/s
0 m/s² and 9.8 m/s
0 m/s and 0 m/s²

Explanation:

Step1: Analyze velocity at highest - point

When a baseball is thrown straight up, at the highest point of its motion, it momentarily stops before starting to fall back down. So the velocity $v = 0\ m/s$.

Step2: Analyze acceleration at highest - point

The acceleration due to gravity near the surface of the Earth is constant and acts downwards throughout the motion of the baseball. Its value is approximately $g=- 9.8\ m/s^{2}$ (negative because it acts in the downward direction). At the highest - point, the acceleration of the baseball is still $a=-9.8\ m/s^{2}$.

Answer:

0 m/s and - 9.8 m/s²