The particle moves from the origin to the point with coordinates (aa, bb) by moving first along the xx-axis to (aa, 0), then parallel to the yy-axis. How much work does the force do

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.