Physics help on acceleration and velocity?

Question

A ball is thrown vertically upward.

a. What happens to the ball's velocity while the ball is in the air?

b. What is its velocity when it reaches its maximum altitude?

c. What is its acceleration when it reaches its maximum altitude?

d. What is its acceleration just before it hits the ground?

e. Does its acceleration increase, decrease, or remain constant?

Answer 1

a. linearly decreases in time to its negative start value

b. 0 m/s

c. -g = -9.81 m/s

d. -g

e. remain constant

Answer 2

the ball's velocity decreases

the velocity is zero at max ht

the acceleration is always 9.8m/s/s directed toward the center of the earth (this answers the last three)