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

AIPMT 2011
A

`\frac { 1 }{ 4 } u\hat { i } +\frac { 3 }{ 2 } u\hat { j }`

B

`\frac { 1 }{ 3 } u\hat { i } +\frac { 2 }{ 3 } u\hat { j }`

C

`\frac { 2 }{ 3 } u\hat { i } +\frac { 1 }{ 3 } u\hat { j }`

D

`\frac { 3 }{ 2 } u\hat { i } +\frac { 1 }{ 4 } u\hat { j }`

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