A tennis ball gun launches tennis balls at 17.6 m/s . It's pointed straight up and launches one ball; 2.0 s later, it launches a second ball. I already found - At what time (after the first launch) are the two balls at the same height? = 2.8s What is that height? = 11m I need - What is the first balls' velocity at that point? What is the second balls' velocity at that point?