A 2-meter ladder is leaning against a wall, forming a 30° angle with the horizontal ground. At the moment the ladder begins to slip, where is the instantaneous center of rotation located?

Explanation

Given the ladder length of 2 m and an angle of 30°, we calculate: (1) is 1.0 m from the wall, (2) is 1.732 m from the wall, (3) is 1.0 m above the floor, and (4) is 1.732 m above the floor. The instantaneous center of rotation lies at positions (2) and (4), corresponding to 1.732 m from the wall and 1.732 m above the floor respectively.