A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 30.0◦above the horizontal. The mass of the box and the books is 40.0 kg. Calculate the normal force acting on the box. Calculate the distance the box of books will travel if the student pulls for 8.0 s.

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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!