4. The accelerations of the blocks A and B respectively as scen in the situation shown in the figure are (pulleys and strings are massless and pulleys are frictionless, acceleration due to gravity is g)?
(A) 2g/3 downward, g/3 upward
(B) 2g/7 downward, g/7 upward
(C) 2g5 downward, g/5 upward
(D) 10g/13 downward, 5g/13 upward
(E) A and B are at rest.
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統計: A(1), B(6), C(2), D(2), E(1) #3093845
統計: A(1), B(6), C(2), D(2), E(1) #3093845