Potential energy exercise

Hi everyone , I’m really stuck with an exercise I can’t solve any question and it is really important ! I need help :

Two identical billiard balls start at the same height and at the same time and roll along different tracks,as shown in figure attached

1- Which ball has the highest speed at the end ?
2- Which one get to end first ? (clearly same questions)

Attached Images
File Type: jpg IMG-20140405-00222.jpg (48.5 KB)

http://ift.tt/1mM5MPS

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