A crate is pulled up using frictionless pulleys, as shown in the diagram, at an angle of 45 degrees. The masses are: for the small pulley, m1 = 2.5kg, for the travelling pulley, M2 = 3.0kg, and for the crate, MC = 13.0kg. What is the minimum tension (in Newtons) with which the operator must pull, in order to slowly raise

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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!