77. A 4.00 kg block rests between the floor and a 3.00 kg block as shown in the figure below. The 3.00 kg block is tied to a wall by a horizontal rope. If the coefficient of static friction is 0.800 between each pair of surfaces in contact, what horizontal force F must be applied to the block to make it move? 5ecb3b3162cbb.jpg
(A) 16.2 N
(B) 23.5 N
(C) 54.9 N
(D) 78.4 N

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統計： A(0), B(0), C(1), D(2), E(0) #2319894