The base of a 52-ft ladder leaning against a wall begins to slide away from the wall. At the instant of time when the base is 48 ft from the wall, the base is moving at the rate of 9 ft/sec.
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How fast is the top of the ladder sliding down the wall at that instant of time?
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A. 20.9 ft/sec
B. 21.6 ft/sec
C. 26.5 ft/sec
D. 17.2 ft/sec
Answer: B
Mathematics
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