Supertek Dynamic Mini-Carts, Set of 2

For experiments in velocity, acceleration, momentum, elastic collisions, and more! Learn by using this Dynamic Carts Set. The plastic cars have deep wells for additional masses, includes two rubber bumpers for inelastic collisions, two spring loops for elastic collisions and instructions. Each measure 5-1/8″ x 2″ x 1-3/8″. Includes 2 sets.