1. The problem statement, all variables and given/known data A physics student in a hot air balloon ascends vertically at a constant speed. Consider the following four forces. that arise in this question. 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 of these 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 3. The attempt at a solution I think it's d) because gravity is pulling the student downwards while the hot air balloon is exerting the same force in the opposite direction, keeping the student in the basket. Is this a correct assumption?