a. When a ball is thrown straight up, by how much does the speed decrease each second?

Question

b. After the ball reaches the top and begins its return back down, by how much does its speed increase each second?

c. Compare the times going up and coming down.

Please Help!!
Thanks!! :)

Answer 1

10m/s i believe and that is going up and down if you neglect air resistance

Answer 2

10m/s for which question (a. b. or c.)?
And also how did you get that answer?
Thanks!