# Chapter 7 - Linear Momentum - Questions: 4

Consider the filled balloon as our system. The air inside the balloon shoots out of the balloon’s opening. The system’s momentum is conserved. The escaping gas gains momentum one way, and the balloon and its remaining gas gain momentum the other way, i.e., they move in the opposite direction.

#### Work Step by Step

This situation may also be analyzed in terms of Newton’s third law.

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