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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