A mass m moving horizontally (along the x-axis) with velocity $v$ collides and sticks to a mass of 3m moving vertically upwards (along the y-axis) with velocity 2$v$. The final velocity of the combination is
${3 \over 2}v\widehat i + {1 \over 4}v\widehat j$
${1 \over 4}v\widehat i + {3 \over 2}v\widehat j$
${1 \over 3}v\widehat i + {2 \over 3}v\widehat j$
${2 \over 3}v\widehat i + {1 \over 3}v\widehat j$
Solution
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