In applying the equation  W = (F cos(?))d to the upward force, which of the following expressions is the correct substitution for the magnitude F of this force? a.)F = 47.0 N b.)F = −mg c.)F = mg d.)F = 47.0 N−mg e.)none of the above

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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!