For exploring the Newton’s motion, the concept of conservation momentum, and elasticinelastic collision of objects in one-dimension. Comprises a pair of wooden trolleys, each carried upon three wheels with ball bearings to minimize friction and a spring loaded exploder plunger with 2 levels of spring compression, which is activated by a trigger knob on top of the trolley. A tough laminated surface mounted on each trolley enables placing of additional masses for increasing the effective weight of the trolley. Velcro pasted at the back end of each trolley enable the study of inelastic collisions.