When a pendulum ball is set free and swings and hit a car -the car on a straight path then hits a train and then the tr
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When a pendulum ball is set free and swings and hit a car -the car on a straight path then hits a train and then the tr
When a pendulum ball is set free and swings and hit a car -the car on a straight path then hits a train and then the train embarcls on a circular path.