4) If your weight is 637 N (downward), how much normal force is acting on you while sitting on level ground? less than 637 N, upward equal to 637 N, upward less than 637 N, downward equal to 637 N, downward   5) You served a volleyball with a 40-N force, directed away from you. How much force does the volleyball exert on you, and in what direction? greater than 40 N, away from you equal to 40 N, away from you greater than 40 N, towards you equal to 40 N, towards you

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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!