A ladder is inclined to a wall making an angle of 30∘ with it. A man is climbing the ladder at the rate of 2 m/s. How fast is he approaching the wall?
A laddre 5 m long is leaning against a wall. The bottom of the ladder is pulled along the ground, away from the wall, at the rate of 2 m/s. How fast is its height on the wall decreasing when the foot of the ladder is 4 m away from the wall?