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For the demonstration of elastic, inelastic collisions, law of conservation of momentum and mechanical energy and other related concepts of force and motion. A pair of three-wheeled wooden carts, with one cart equipped with three-step plunger and release mechanism to provide for a variety of weak and strong collisions with the other car. Free end of the plunger is cushioned with rubber stopper to minimize the impact marks of plunger on other cart. Both the carts have equal mass. The top of the carts is covered with wooden laminate for loading the cart with different masses (masses not included). The hard plastic wheels with bearings minimize friction. The carts have Velcro attached to them for studying inelastic collisions.