Two forces, one equal to 15 N and another equal to 40 N, act on a 50-kg crate resting in a horizontal surface as shown in figure 2.55  a) what is the net horizontal force on the crate? b) what is it's horizontal acceleration? c) if the crate starts from rest , what is the horizontal speed after 5s? d) How far has the crate traveled along the surface in this time?

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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!