mass is 71 kg and his little sister's mass is 15 kg.     Which of the following statements is correct? The force experienced by Tom is less than the force experienced by his sister. The force experienced by the sister is less than the force experienced by Tom.      They both experience the same force.

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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!