The figure shows an overhead view of a 0.0270 kg lemon half and two of the three horizontal forces that act on it as it is on a frictionless table. Force ₁ has a magnitude of 5.00 N and is at 0₁ = 33.0°. Force F₂ has a magnitude of 8.00 N and is at 02 = 28.0°. In unit-vector notation, what is the third force if the lemon half (a) is stationary, (b) has the constant velocity ✓ = (12.0î – 15.0)) m/s, and (c) has the varying velocity v = (10.0tî - 15.0t)) m/s, where t is time? K 0₁ 0₂

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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!