If I pull a 120kg sled with 240N of force and it accelerates with an acceleration a=0.5m/s^2, what is the coefficient of friction between the box and the floor? I now have my 20kg dog in the sled. If I pull with the same force, what is the acceleration of the sled?

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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!