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A.v¡äA =3 m/s¡¢v¡ä B = 3.5 m/s
B.v¡äA =3.2 m/s¡¢v¡ä B = 3.2 m/s
C.v¡äA =£2 m/s¡¢v¡ä B = 11 m/s
D.v¡äA =5 m/s¡¢v¡ä B = 0.5 m/s
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