1. As shown in Fig. 1, the force $\vec{F}=7.0\hat{x} N$, and all three blocks move without friction. Find the force on block A from block B.
(A) -7.0
N
(B) -6.3
N
(C) -5.6
N
(D) -4.9
N
(E) None
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統計: 尚無統計資料
統計: 尚無統計資料