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Momentum form of Newton's second law is useful for systems whose mass changes, such as:
APendulums
BSprings
CWheels
DRockets
Answer & Solution
Correct answer: D. Rockets
1. F = ma assumes constant mass.
2. Rockets lose mass as fuel burns.
3. The momentum form still applies.
_Source: OpenStax College Physics for AP Courses 2e, Chapter 8, Linear Momentum and Collisions (CC BY 4.0)._
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