According to hobbes, why do humans participate in a social contract? check all that apply.
a. to provide total liberty to all
b. to one another
c. to limit opportunities to harm one other
d. to work individually without support

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.