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A 10 m ladder's base slides from a wall at 3 m/s. How fast does the top fall when the base is 6 m out?
A1.5 m/s
B2.25 m/s
C3 m/s
D4 m/s
Answer & Solution
Correct answer: B. 2.25 m/s
The height is 8 m, and x dx/dt + y dy/dt = 0 gives dy/dt = -(6 × 3)/8 = -2.25 m/s.
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