Youre atop a building of height h, and a friend is poised to drop a ball from a window
Chapter 2, Problem 67(choose chapter or problem)
Youre atop a building of height h, and a friend is poised to drop a ball from a window at Find an expression for the speed at which you should simultaneously throw a ball downward, so the two hit the ground at the same time.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer