A 15-ft ladder is leaning against one wall of an alley 9 ft wide. the ladder slips, its top sliding down the wall, its foot sliding across the alley and striking the opposite wall at a speed of 4 ft/sec. How fast is the top of the ladder falling at that instance?

Question

Yazmin

22 October, 07:35

+4

Answers (1)

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Chief · Answer 1

2x dx/dt + 2y dy/dt = 0

x dx/dt + y dy/dt = 0

9*4 + 12 dy/dt = 0

dy/dt = - 3 ft/sec