Classic demonstration of Newton's Second Law and projectile motion.  At the same instant, one steel ball is dropped from rest while the other is launched horizontally from the same height.  Which one strikes the ground first, or do they strike the ground at the same time?  Demonstrates the independence of horizontal and vertical forces and motion.  Launcher comes with bar so that it may be clamped to a ringstand to maximize elevation.  Heavy, cast iron construction. Overall length:  11 inches.