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__use conservation of energy__to find it's speed at the bottom of the swing.

* 2.3 m/s

* 2.6 m/s

* 2 m/s

* .5 m/s

I don't really understand how to use conservation of energy that well, so I need help. How would I apply that for this problem? And how do I solve from there? Any help would be much appreciated. I need it by tomorrow night. Thanks.