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Thread: which one spends the shortest time???

  1. #1 which one spends the shortest time??? 
    Junior Member
    Join Date
    Jul 2013
    Posts
    1
    48d083025aafa40f45775c29aa64034f79f019b4.jpg

    as u see, the small ball A is put at the point a without speed.
    there are three tracks----no friction

    question: which track spends the shortest time?



    thx
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  2. #2  
    Junior Member
    Join Date
    Sep 2017
    Posts
    2
    The time is equal for every of the ball.
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