Is Acceleration Different During a Baseball's Flight?

[pttest]

Homework Statement

A batter hits a pop fly straight up.
a) Is the acceleration of the ball on the way up different from its acceleration on the way down? (YES / NO)
b) Is the acceleration of the ball at the top of its flight different from its acceleration just before it lands?Yes / No?

Homework Equations

The Attempt at a Solution

a. There is no difference in acceleration on the way up & down.
b. Yes. I was wondering at the top of its flight the ball slows down and the ball doesn't slow down right before it lands. Am I correct?

Thanks in advance

 

[rl.bhat]

b) No. Slowing down or speeding up depends on the direction of the velocity, not on the acceleration due to gravity, which is always in the downward direction.

 

[~ak~]

a) Upwards the acceleration is gravity and downwards the acceleration is gravity...the initial veloicty may be positive but the acceleration is not, once the ball is hit, it has negative acceleration.