Block A lies on the top of block C and is connected with block B by a massless unstretchable string passing over a massless and frictionless pulley. Block B is also in contact with the block C (see picture). Masses of blocks A and B are the same mA =mg =m and the coefficient of friction between each of them and block C is µ. (a) What should be a constant acceleration a in horizontal direction from the left to the right of the whole system in order that blocks A and B do not move with respect to the block C? (b) What will be an acceleration of the blocks A and B if the whole system initially is at rest and then blocks A and B are released and start moving (Hint: in both cases start with free body diagrams for blocks A and B) A

Block A lies on the top of block C and is connected with block B by a massless unstretchable string passing over a massless and frictionless pulley. Block B is also in contact with the block C (see picture). Masses of blocks A and B are the same mA =mg =m and the coefficient of friction between each of them and block C is µ. (a) What should be a constant acceleration a in horizontal direction from the left to the right of the whole system in order that blocks A and B do not move with respect to the block C? (b) What will be an acceleration of the blocks A and B if the whole system initially is at rest and then blocks A and B are released and start moving (Hint: in both cases start with free body diagrams for blocks A and B) A