Two masses are connected and placed on an frictionless inclined plane which makes 30° with the horizontal as shown in the figure below. The system is then pulled with a string which is parallel to the plane. If the pull in the string is 60 N, m¡ = 2kg, find the tension in the tension in the string which connects the two masses. Figure 15. 4kg and m2 = 60 N mi m2 30°

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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!