can someone help me out with the first part. the equations i used to try to work this out were mg-t=m(b) and t=m(g/2+b) where b stands for the acceleration of both the particles. however this gets me b=g/4 and this is not the correct answer. the correct answer is 3g/4 . by the way sorry the picture is not clear it says the acceleration of the block is g/2 in the question.