A loaded sled with a weight of 500 N slides down a frictionless incline with an acceleration of 2.0 \frac{m}{s^2}s2m​. The angle of inclination is not given. What is the normal force of the slope's surface on the sled? A)489 N b)500 N C)357 N D)291 N

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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!