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A physics group defines a system with constant mass and no outside push. That system is:

ACurved
BClosed
CCracked
DCharged
Answer & Solution
Correct answer: B. Closed
1. No mass enters or leaves the group. 2. No outside force acts on it either. 3. Such a system is called closed. _Source: OpenStax University Physics Volume 1, Chapter 9, Linear Momentum and Collisions._
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