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A ball of mass $m$ is moving with speed $v$ towards another ball of mass $m$ attached to point $P$ by a light rod, as shown in the figure above. The two balls stick together.

Their angular speed immediately after the collision is

A

$v/l$

B

$2v/l$

C

$v/2l$

D

$v/3l$

E

$v/4l$

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