Problem 2-43, page 2-37.
A baseball pitcher throws a ball vertically straight upward and catches it 4.2 s later. (a) With what velocity did the ball leave the pitcher's hand? (b) What was the maximum height reached by the ball?

This is a problem of motion taking place at:
 
 

(a) constant velocity.

(b) constant acceleration.

(c) variable acceleration.