On a snowy day, a child pulls a loaded sled (mass 25.0 kg) along flat, horizontal ground with an applied force of 83.0 N [East]. There is a frictional force of 67.0 N [West] acting on the sled. i) Find the acceleration of the sled.   ii) Calculate the coefficient of kinetic friction between the sled and the ground.

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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!