Q5) A child pulls a wagon with a force of 20N by a rope making an angle of 25° with the horizontal. If the wagon has a mass of 12.0 kg (a) What is the horizontal acceleration of the wagon? (b) If the wagon starts at rest, how fast is it going after being pulled for 8 seconds? 20. N 25 Horizontal

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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!