Answer:
a. Positive and decreasing
b. 0
c. -9.81 m/s2
d. -9.81 m/s2
e. -9.81 m/s2
Explanation:
a. Since there's a constant gravitational acceleration acting downward, an upward velocity would decrease over time, until it reaches 0 at it's maximum altitude.
b. It's 0 at maximum altitude as it's no longer progressing upward. Otherwise it wouldn't be a maximum altitude.
c. d. and e. Doesn't matter where the ball is, it'd be always subjected to a constant gravitational acceleration, which is 9.81 m/s2/
