A physics student in a hot air balloon ascends vertically at constant speed. Consider the following four forces present in this situation: 1 = the weight of the hot air balloon 3 = the force of the student pulling on the earth 2 = the weight of the student 4 = 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?

The two forces that form an "action-reaction" pair that obeys Newton's third law are forces 2 and forces 3

Explanation:

The force by which student pulls the earth will be equal in magnitude and opposite in direction to the force by which earth pulls the student l.e his weight.

Therefore, the two forces are

3 = the force of the student pulling on the earth and

2 = the weight of the student

the answer is a)

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