Q- Three blocks of masses 1.0, 2.0 and 4.0 kilograms are connected by massles strings, one of which is frictionless with negligible mass as shown above over a pulley. a-) Determine the acceleration of the 4 kilogram block. b-) Determine the stress in the rope supporting the 4-kilogram block. c-) Determine the stress in the rope attached to the 1 kilogram block