摘要:A.v1=16 m/s.v2=15 m/s.t=3s. B.v1=16 m/s.v2=16 m/s.t=2s.C.v1=20 m/s.v2=20 m/s.t=3s. D.v1=20m/s.v2=16 m/s.t=2s.

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