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Two solid subber balls A and B having ma...

Two solid subber balls A and B having masses 0.2 and 0.4 are moving in opposite directions with velocity of A equal to 0.3 `ms^-1` After collission, the two balls come to rest when the velocity of B is

A

`0.15 ms^-1`

B

`1.5 ms^-1`

C

`-0.15 ms^-1`

D

zero

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