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A mass m moving horizontally (along the x-axis) with velocity v collides and sticks

A mass m moving horizontally (along the x-axis) with velocity v collides and sticks to mass of 3m velocity 2v. The final velocity of the combination is

Options

(a) 1/4 vi + 3/2 vj
(b) 1/3 vi + 2/3 vj
(c) 2/3 vi + 1/3 vj
(d) 3/2 vi + 1/4 vj

Correct Answer:

1/4 vi + 3/2 vj

Explanation:

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