A 26 foot ladder leans against a vertical wall If the base of the ladder begins sliding away from the wall at 4 ft second while

Question

A 26 foot ladder leans against a vertical wall If the base of the ladder begins sliding away from the wall at 4 ft second while the other end of the ladder maintains contact with the wall how rapidly is the top of the ladder moving down the wall when the base is 10 feet away from the wall The top is moving downward at ft sec

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