Question

A+force+of+12+N+pulls+a+block+of+mass+3.5kg+through+a+rope+of+mass+0.5kg.+The+block+is+resting+on+a+horizontal+frictionless+surface.+what+is+the+force+of+reaction+exerted+by+the+block+on+the+rope

Answer 1

acceleration of system: 12/4.0=3m/s

force on block: 3.5kg*3m/s=11.5N
reaction force= 11.5N (Newtons third law.