Discussion
An engine passes \( 80 \ \mathrm{kg/s} \) with an exit velocity of \( 500 \ \mathrm{m/s} \) while flying at \( 200 \ \mathrm{m/s} \). The net thrust, ignoring pressure terms and fuel flow, is
Answer: A
Net thrust is the mass flow times the velocity increment, \( 80 \times (500-200) = 24\,000 \) newtons. The gross thrust would be 40 kilonewtons, and the 16 kilonewton difference is exactly the ram drag of the incoming air.
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