A 4 kg toy car moving at 6 m/s slams into a 4 kg toy car at rest. What is the speed of the two stuck together cars after they collide?
ete

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

Th answer is 3200 m/s