Two balls the same size but of different materials , rubber and iron are kept on
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Two balls the same size but of different materials , rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed? Give reasons for your answer.
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No. The two balls will move with different speeds.

This is because the inertia of the two balls is not the same.

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