Two bodies A and B move toward each other with speeds of 80 cm/s and 20 cm/s,respectively.The mass of A is 140 g and that of B is 60 g.After a head-on,perfectly elastic collision,the speed of B is
A)8.0 cm/s
B)20 cm/s
C)92 cm/s
D)1.2 m/s
E)1.3 m/s

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The Answer of Two bodies A and B move toward each other with speeds of 80 cm/s and 20 cm/s,respectively.The mass of A is 140 g and that of B is 60 g.After a head-on,perfectly elastic collision,the speed of B is
A)8.0 cm/s
B)20 cm/s
C)92 cm/s
D)1.2 m/s
E)1.3 m/s

Two Bodies a and B Move Toward Each Other with Speeds