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Answer:By momentum conservation
m1u1=m2v2−m1v1
v2+v1/0+u1 =e=1
v2+v1=u1
∴m1(v2+v1)=m2v2−m1v1
m1(v2+2v1)=m2v2 v1=v2=v
m1/m2=v/3v
=1/3
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