A 150-kg crate is on a table. A little amount of push from the top was applied to it. Which of the following is true?   The normal force increases. The normal force decreases. The weight of the crate increases. The weight of the crate decreases.

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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!