Two carts crash on a frictionless track with no outside push. The total momentum after is:
ADoubled
BErased
CThe same
DHalved
Answer & Solution
Correct answer: C. The same
1. The two carts form a closed system.
2. Inside forces cannot change the group total.
3. So the total momentum is unchanged.
_Source: OpenStax University Physics Volume 1, Chapter 9, Linear Momentum and Collisions._
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