A particle of mass \( m \) moving eastward with a speed \( v \) col...

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A particle of mass \( m \) moving eastward with a speed \( v \) collides with another particle of the same mass
\( \mathrm{P} \) moving northward with the same speed \( v \). The two

W particle coalesce on collision. The new particle of mass \( 2 m \) will move in the north-easterly direction with a velocity.
(1) \( v / 2 \)
(2) \( 2 v \)
(3) \( v / \sqrt{2} \)
(4) \( v \)
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