A ladder 5 m long is leaning against a wall. The bottom of the ladder is pulled along the
Channel: Doubtnut
Date: 2020-07-05

A ladder 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 2cm/s. How fast is its height on the wall decreasing when the foot of the ladder is 4 m away from the wall ?