You are riding a bicycle. You apply a forward force of 50 N, and you and the bicycle have a combined mass of 100 kg. What is the acceleration of the
bicycle?
A. 2.00 m/s2
B. 1.50 m/s2
C. 1.00 m/s2
D. 0.50 m/s2

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.