10.In the figure, blocks B and C have masses 2m and m, respectively, and are at rest on a frictionless surface. Block A, also of mass m, is heading at speed v toward block B. Assume all collisions are elastic. After all subsequent collisions are over, which of the following final velocity is necessarily true?

(A)
(B)
(C)
(D)
(E)

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統計: A(0), B(4), C(0), D(0), E(0) #3427010

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