A body of mass 'm' moving with 3 km hr^(...

A body of mass 'm' moving with `3 km hr^(-1)` collides with a body of mass 2 m at rest and sticks to it. The combination starts moving with velocity :

`4 Kmhr^(-1)`

`3 Kmhr^(-1)`

`2 Kmhr^(-1)`

`1 Kmhr^(-1)`

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