A Few General Questions (Help)

[spdrxc]

1) Can the velocity of an object reverse direction while maintaining a constant acceleration? Can anyone give me an example of this?

2) What is the acceleration of a rock at the top of its trajectory when thrown straight upward? (Is it consistant with Newton's second law?)

If would really appreciate it if someone could help me out with these questions. Thank you guys for your time.

[Tide]

1) Yes - toss a rock straight up and watch it carefully!

2) It's exactly the same as it is at every other point along its trajectory - ignoring air drag, etc.