If all forces have a reaction that is equal and opposite how can the horse and cart move

Asap and show ! a 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.

From the perspective of an employee that effective channeling of work related information and concerns

When using the scientist method, which step comes last?