In one of the experiments, the trolley of mass 0,2 kg is on a frictionless horizontal table. The trolley is joined to a hanging masspiece of mass 0,05 kg. The trolley and the masspiece are joined together with an inelastic string of negligible mass and runs over a frictionless pulley. .7 0,2 kg 0,05 kg

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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!