The results of a wind tunnel test to determine the drag on a body (see Fig. P5.65) are summarized below. The upstream [section (1)] velocity is uniform at 100 ft/s. The static pressures are given by p1 = p2 = 14.7 psia. The downstream velocity distribution, which is symmetrical about the centerline, is given by

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total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this