A marble is moving on a perfectly smooth horizontal surface with uniform speed and no external force. Choose the correct observation.

It will stop after some time.

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It will accelerate.

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It will keep moving forever at constant speed.

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It will experience high frictional force.

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Solution

The correct option is C It will keep moving forever at constant speed.
The motion of marble is uninterrupted because of the frictionless surface and there is no net external force acting on it. According to Newton's first law, it will keep on moving forever at the same speed until and unless an external force is applied.

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