I saw  [this video][1] on YouTube in which two balls slide down on different inclines. 

The part which confused me was the one at **2:00** seconds. I couldn't understand why the two balls hit the bottom at the same time or why the two pendulums released from different angles have the same time period ?  

If we drop two balls from different heights they do take different time to come down . But here they are coming simultaneously. 


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One reason which I thought could be that the velocity gained by the balls is proportional to length of the incline but I am not sure and couldn't digest it . 


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Can someone give me the reason for that ?


  [1]: https://youtu.be/JWtsOiVxIIE