Two children pull a third child backwards on a snow-saucer sled exerting forces F1 = 9.5 Nand F2 = 4.5 N, as shown in the figure. Note that the direction of the friction force, f = 5.9 N, is unspecified; it will be opposite in direction to the sum of the other two forces.  Find the magnitude, in meters per squared second, of the acceleration of the 42 kg sled and child system

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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!