Abowling ball has a momentum of 12 units when it hits a bowling pin, with a momentum of 0 units. after hitting the bowling pin, the ball has a momentum of 8 units. what is the momentum of the pin after being hit by the ball?

4 units
8 units
12 units
20 units

MOMENTUM IS CONSERVED  (law of Nature)

That means that momentum can move from one object to another object, but it's never created or destroyed.  The amount of momentum AFTER something is the same as it was BEFORE.

Before:

(ball momentum = 12), (pin momentum = 0)

Ball + Pin = 12 unts

After:

Momentum is conserved.

Ball + Pin still has to be 12 units

Ball = 8 units

So Pin has to be the other 4 units.

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