A 12 kg ball moving at 37 m/s East strikes a second 15 kg ball going 25 m/s in the opposite direction. Find the velocities of the two balls after this elastic collision.

Answermuch larger;

Gravity, from the center of mass of the box, extending downward normal force, from the floor under the box, extending upward, equal to gravity push force, acting at a point on the box, extending in the direction of motion friction, acting at any point on the box directly opposite the push, extending directly opposite to the motion