If an 80 kg motorcycle is pushed using 50 N on a concrete road with a coefficient of kinetic friction of 0.4, what is the magnitude of the force of friction opposing the motion of the motorcycle? * a.314 b. 400 c. 784 d. 1,000

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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!