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THANKS..KEEP ANSWERING MY QUESTIONS LIKE THIS AS I HAVE MY MANIPAL ENTRANCE EXAM ON 18TH APRIL...THANKS
The tension of a string is different due to centrifugal force. While gravity is always directed downward, the centrifugal force is directed upward at the highest point and downward at the lowest point. So, the tension force is a sum of gravity and centrifugal force at the lower point, and a difference at the highest, see the first two Eqns. All the rest is mathematics.
please provide another explanation...not understood