A uniform ladder of length l rests against a smooth, vertical wall. If the mass of the ladder is m and the coefficient of static friction between the ladder and the ground is 0.40, find the minimum angle at which the ladder does not slip.
What If? What if a person begins to climb the ladder when the angle is 51°? Will the presence of a person on the ladder make it more or less likely to slip?

51.3 Degrees

The presence of person above the center of mass of ladder will make the ladder more likely to slip.

Explanation:

Explanation in the attachment.

explanation: in any substance/object, the particles inside it (atoms/molecules) constantly move in random directions and with random speeds (this motion is called brownian motion). as a result, the particles have some kinetic energy (which is proportional to the temperature of the substance).

explanation:

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what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s