Discussion
An engine takes in \( 100 \ \mathrm{kg/s} \) of air, exhausting it at \( 400 \ \mathrm{m/s} \) while flying at \( 250 \ \mathrm{m/s} \). Ignoring fuel flow, the thrust is
Answer: A
Thrust is the mass flow times the velocity increment, \( 100 \times (400-250) = 15\,000 \) newtons. It is the change in velocity that matters rather than the exhaust velocity itself, which is why a fast jet produces no thrust at all once the aircraft matches its speed.
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