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A ball on the end of a string is revolved at a uniform rate in a verticle circle of radius 65 cm. If its speed is 4.25 m/s and its mass is .300 kg, calculate the tension in the string when the ball is (a) at the top of its path, and (b) at the bottom of its path.

i tried using the equation: (EF)=ma....but i think you use that later on?

there's another equation that i think i might have to use to solve this problem, however im not sure on how to find v1 and v2. this equation is:

FT1 + mg = m * (v2,1/r).