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Answer:
D. 2200 ft.lb/s
Explanation:
First, recall the standard conversion between horsepower and foot-pounds per second.
[tex]1hp=550\; \frac{ft\cdot lb}{s}[/tex]Therefore:
[tex]4\; hp=4\times550=2200\; \frac{ft\cdot lb}{s}[/tex]The correct choice is D.