A block of mass mA = 8.80 kg rests on a scabrous plane of coefficient of static friction µs = 0.36, and friction dynamic μd = 0.30. The mA mass is attached, via a rope inextensible, at another point mass material mB = 5.20 kg via an inextensible rope (see figure) flowing without friction in the recess of a pulley. Calculate: a) the mass me that we must rest on the mass m not to make it move; b) the acceleration of the masses if mass mc is removed. mc MA ma m₂

A block of mass mA = 8.80 kg rests on a scabrous plane of coefficient of static friction µs = 0.36, and friction dynamic μd = 0.30. The mA mass is attached, via a rope inextensible, at another point mass material mB = 5.20 kg via an inextensible rope (see figure) flowing without friction in the recess of a pulley. Calculate: a) the mass me that we must rest on the mass m not to make it move; b) the acceleration of the masses if mass mc is removed. mc MA ma m₂