A mass m moving horizontal (along the x-...

A mass `m` moving horizontal (along the x-axis) with velocity `v` collides and stricks to mass of `3m` moving vertically upward (along the y-axis) with velocity `2v`. The final velocity of the combination is

`2/3vhati+1/3vhatj`

`3/2vhati+1/4vhatj`

`1/4vhati+3/2vhatj`

`1/3vhati+2/3vhatj`

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