Girl who’s mass is 52kg, experienced a net force of 1800N at bottom of a roller coster loop during her school physics field to the local amusement park, determine Sophia’s acceleration at location.

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.