A ball is thrown vertically upward. What are its velocity and acceleration when it reaches its maximum altitude? What is its acceleration just before it hits the ground?

Velocity at maximum height is zero. Acceleration at maximum height is 9.81 m/s² downward. Acceleration when it just hits the ground is 9.81 m/s² downward.

Explanation:

For a ball thrown vertically upward, the velocity at maximum height is zero.

Acceleration is a constant for a ball thrown vertically upward, its is acceleration due to gravity.

Acceleration at maximum height is 9.81 m/s² downward.

Acceleration when it just hits the ground is 9.81 m/s² downward.