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Unformatted text preview: (b) We have ...(3). Differentiate (3) with respect to time, we get ...(4). Given x = (1/2)(90ft) = 45 ft, then Since x is increasing, then dx/dt = 24 ft/s. Putting the data into (4), then dr/dt = 10.7 ft/s....
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 Spring '10
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