Two tennis ball launchers are used to launch tennis balls onto the street below. Launcher A is on the 3rd floor (8 m above the ground) and launches the upwards at an unknown angle and unknown speed. Launcher B is on the 4 ^ (th) floor (12 m above the ground) and launches its ball horizontally at 20m / s If the balls are launched at the same time and land in the same spot at the same time, what is the launch velocity of the ball from the 3rd floor?
