A physics student in a hot air balloon ascends vertically at constant speed. Consider the following four forces present in this situation.
(F1) the weight of the hot air balloon
(F2) the weight of the student
(F3) the force of the student pulling on the Earth
(F4) the force of the hot air balloon pulling on the student.
Which two forces form an "action-reaction" pair that obeys Newton's third law?
A) F1 and F2
B) F2 and F3
C) F1 and F3
D) F2 and F4
E) F3 and F4