Mary applies a force of 78 N to push a box with an acceleration of 0.49 m/s2. When she increases the pushing force to 84 N, the box's acceleration changes to 0.64 m/s2. There is a constant friction force present between the floor and the box. (a) What is the mass of the box in kilograms?  kg (b) What is the coefficient of kinetic friction between the floor and the box?

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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!