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## Homework Statement

Currently studying for a physics final on Wednesday 12/12/12

The problem can be found here

## Homework Equations

Not very sure.

v

_{fball}=(v

_{0}(m

_{ball}-m

_{plank})+2m

_{plank}v

_{0,plank})/(m

_{ball}+m

_{plank)}

m

_{ball}v

_{0}=(m

_{ball}+m

_{plank})v

_{f}

## The Attempt at a Solution

I have no idea how to do a. I've tried

v

_{fball}=(v

_{0}(m

_{ball}-m

_{plank})+2m

_{plank}v

_{0,plank})/(m

_{ball}+m

_{plank)}

But it just comes to 0.

b.

I've thought about it and the only possible way to get the answer given that I can think of is this:

m

_{ball}v

_{0}=(m

_{ball}+m

_{plank})v

_{f}

mv

_{0}=2mv

_{f}

v

_{f}=v

_{0}/2

Does this involve angular momentum as well? Or inertia? Any help would be gratefully appreciated!