Q. Two air carts of mass = 0.9 and = 0.40 are placed on a frictionless track. Cart 1 is at rest at first, and has a spring bumper with a force constant of 690. Cart 2 has the flat metal surface for a bumper, and moves toward the bumper of the stationary cart with an initial speed = 0.64. Assume that positive -axis is directed toward the direction of motion of cart 2.