. You drop a ball from a window on an upper floor of a building and it is caught by a friend on the ground when the ball is moving with speed vf. You now repeat the drop, but you have a friend on the street below throw another ball upward at speed vf exactly at the same time you drop your ball from the window. The two balls are initially separated by 28.7 m. (a) At what time do they pass each other? (b) At what location do they pass each other relative the window?

Question

.  You drop a ball from a window on an upper floor of a building and it is caught by a friend on the ground when the ball is moving with speed vf.  You now repeat the drop, but you have a friend on the street below throw another ball upward at speed vf exactly at the same time you drop your ball from the window.  The two balls are initially separated by 28.7 m.  (a)  At what time do they pass each other?  (b)  At what location do they pass each other relative the window?

noelgreco · Answer

Remember, one's speeding up, the other is slowing down, and they'll ve exchanging speeds.  What does your intuition say?

anonymous · Answer

Which formula would I use?