An applied force of 41 N causes a 7.5 kg box to accelerate at a rate of +2.8 m/s2 across a table. -What is the coefficent of friction? -What is the net force? -What is the normal force?

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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!