This law states that oppositely charged objects will exert an attractive force on each other while two objects that have like charges will repel each other. the attractive force varies with the size of the charges as well as the distance between them.

A14 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.