Discussion
Holland's formula gives momentum rise proportional to \( v_s d / u \). Doubling exit velocity at constant diameter and wind speed changes that term by a factor of
Answer: B
Correct answer: 2
The momentum term is proportional to \(v_s d / u\), and it is linear in exit velocity. With \(d\) and \(u\) unchanged, doubling \(v_s\) doubles the term.
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