si en un instituto se bachilleran 130 estudiantes. si en el día de la graduación lo ordenaron en sucesión aritmética con 20 en la primera fila y 32 en la última, cuantas filas se formaron?​

The answer is observations and interpreting.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on