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As per your syllabus, if F_ext on the system is zero, the total linear momentum of the system does which?
AOscillates over time periodically
BStays constant (is conserved)
CAlways increases steadily
DAlways decreases steadily
Answer & Solution
Correct answer: B. Stays constant (is conserved)
Your syllabus: F_ext = 0 ⇒ dP/dt = 0 ⇒ P conserved.
Underlies many isolated-system problems.
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