Force 1 is supposed to be {100.0 grams · g, 60.0o} and Force 2 is supposed to be {200.0 grams · g, 120.0o}. You will apply a third force to balance the system--how much force should you apply? Answer to three significant figures, in units of grams · g.

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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!