A 20-lb homogeneous box has tipped and is resting against a 40-lb homogeneous box as shown in figure attached. The coefficient of friction between box A and the floor is 0.7, and between box B and the floor is 0.4. Consider the contact surface between the two boxes as smooth and determine if the boxes are in equilibrium.

 

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12 in. 24 in. 24 in. 30 24 in. 12 in. 24 in. 24 in. 30 24 in.