A light string connects three blocks, two of which are being pulled across a frictionless horizontal tabletop as the third block is hanging from the massless pulley. Block A has a mass of =2.50 , block B has a mass of =1.50 and block C has a mass of =2.00 . Find: a) the tensions in the strings between the blocks, 1 and 2; and b) the acceleration of the system. Be sure to include the free-body diagram for all of the considered objects. Please I need step by step