When the train moves evenly, the ball lies quietly on the table, if the train stops suddenly. Where will the ball roll?

The ball will roll forward along the movement of the train as the train will reduce its speed, and the ball will keep the speed at which the train was moving. Based on Newton’s First Law.
The inertia of the ball determines the ability of the ball to prevent changes in its vector and the value of the speed of the ball.



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