4. Four masses are located in the corners of a square. Calculate the magnitude and direction of the gravitational field at the center of the square. Given: m1 = 85 kg, m2 = 3 kg, m3 = 3 kg, m4 = 85 kg, r = 8 m. G = 6.674 x 10-11 N•m2/kg2.

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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!