In the system shown in Figure P5.45, a horizontal force Fx acts on an object of mass m2 = 8.00 kg. The horizontal surface is frictionless. Consider the acceleration of the sliding object as a function of Fx. (a) For what values of Fx does the object of mass m1 = 2.00 kg accelerate upward? (b) For what values of Fx is the tension in the cord zero? (c) Plot the acceleration of the m2 object versus Fx. Include values of Fx from 2100 N to 1100 N.