A horse is pulling a wagon of mass 400 kg horizontally with a constant acceleration of 0.1 m/s^2 on a frictionless surface. a) Draw a free body diagram b) What is the horizontal force with which the horse is pulling the wagon? c) If the horse starts from rest, how far does the horse pull the wagon in 40 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!