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A 1.2 Kg mass on the end of a string is routed in a vertical circle of radius 0.85m. If the speed of the mass at the top of the circle is 3.6 m/s, What is the tension in the string at this location?

a. 6.5 N

b. 12 N

c. 18.5 N

d. 24 N

e. 30.5 N

PS: option c and e are incorrect so which one would be be right.

According to the question, it is given that: