4.Blocks of 1, 2, and 3 kg are lined up on a frictionless table, as shown in the figure, with a 12-N force applied to the leftmost block. What's the magnitude of the force that the rightmost block exerts on the middle one?
(A) 1 N
(B) 2 N
(C) 3 N
(D) 6 N
(E) 12 N
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統計: A(0), B(1), C(1), D(3), E(0) #3427004
統計: A(0), B(1), C(1), D(3), E(0) #3427004