A box of mass 40 kg, initially at rest, is pushed by a horizontal force of 200 N for 6 sec. The friction between the box and the floor is 20 N. How far does the box travel in 6 sec?                 a) 41 m                b) 81 m           c) the box does not move

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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!