The helicopter view in Figure P1.70 shows two people pulling on a stubborn mule. Find the force a third person would have to exert on the mule to make the net force equal to zero. The forces are measured in units of newtons (N). See figure below. F₂=80.0 N F₁ = 120. N 75.0 60.0⁰ Figure P1.70

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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!