In the given figure below, both masses m1 and m2 are attached with a string. Mass m1 is moving on its right, and mass m2 is moving downwards. The opposite force of the weight of the mass m2 (hanging mass), acting on m2 is 21 T M-₂ the downward tension on its string O the upward friction O the downward friction O the upward tension on its string.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!