A person is pulling a wagon of heavy rocks for the garden with a force of 12 N. Another person wants to help and pushes the wagon from behind with a force of 8 N. The frictional force is 6 N. What is the net force on the wagon?

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.