Ball mass 0.4 kg is connected to massless string length 0.6 m. It's rotated vertically in uniform circular motion with speed 5m/s. What is tension when theta is 0 degree with respect to vertical

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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!