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When a football player hits a goalpost, momentum is still conserved because the Earth also:
ASpins
BWarms
CShrinks
DRecoils
Answer & Solution
Correct answer: D. Recoils
1. The force on the post is passed to the Earth.
2. The Earth recoils immeasurably.
3. Total momentum stays constant.
_Source: OpenStax College Physics for AP Courses 2e, Chapter 8, Linear Momentum and Collisions (CC BY 4.0)._
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