You are waiting in line for your favorite ride and carrying a backpack with you that weighs 20 N. You’ve been standing in the SAME spot in line for 5 minutes how much power do you use? Explain your answer.

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.