A 0.2 kg ball attached to a 1.5 meter string moves in a vertical circle. What is the minimum speed that theball must have at the top so that it continues to move in a circle?

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A: Given : m = 0.2 kg r = 0.6 m v = 4 m/s

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!