An 8m ladder is leaning against a vertical wall for a repair of crack on the wall of your farm. The bottom of the ladder is pulled horizontally away from the wall at 1.5m/s how fast is the wall when the bottom of the ladder is 5m away from the wall.

Answer 1

x^2 + y^2 = 64
when x=5, y=√39
x dx/dt + y dy/dt = 0
so plug in your numbers and solve for dy/dt