Conservation of angular momentum



I guess this must be a trivial question.
Nevertheless I am having trouble with it.

Say there are two bodies in motion approaching each other. One of them
is a ball and another of a dumbbell shape. Both of them are in pure
translation with no rotation about any axis.

As the ball hits one end of the dumbbell it (dumbbell) starts
spinning.

How would you account for the fact that there was no net angular
momentum before collision, while there is after the collision?

Mark

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