A 1.3 Kg ball is moving on a horizontal frictionless surface with 10m/s. It collides with a vertical wall and rebounds back with forth of its kinetic energy before the collision. What is the magnitude of the force on the ball from the wall if the contact time is 12.6 ms?

Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. when the carts collide, they hook together. assume that positive momentum is to the right. which graph best represents the momentum of both carts over time, before and after the collision?