A 6.0kg mass is moving to the right at 1...

A `6.0kg` mass is moving to the right at `10 m//s`. A `0.25kg` mass is fired toward the left at the larger mass. What speed `(v)` must the smaller mass have to completely stop both masses?

`4.2m//s`

`15m//s`

`150m//s`

`240m//s`

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The correct Answer is:

Ans.(4)
Momentum conservation
`10xx6-25xxv=0` `v-240m//s`

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