Question

A 12-ft ladder is leaning against a vertical wall when Jack begins pulling the foot of the ladder away from the wall at the rate of 0.5ft/s. What is the configuration of the ladder at the instant that the vertical speed of the top of the ladder equals the horizontal speed of the foot of the ladder?
At the instant that the vertical speed of the top of the ladder equals the horizontal speed of the foot of the ladder, the ladder will be forming an angle of 45 degrees with the wall.

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