Demonstrates that the forward velocity of a ball ejected vertically is the same as the forward velocity of the vehicle from which it is ejected. Consists of a car with hardened cone bearings sensitive enough that the car will roll on an incline as slight as 1°.
Includes a vertical spring-loaded barrel and a 1"-diam steel ball. The ejection mechanism, which has 2 settings, is controlled by a release pin and cord. Instructions included.