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Hi, for this question

http://tinyurl.com/2qgco5

this is the solution for (b)

http://tinyurl.com/yrl64q

May I know why for centripetal motion, it is mg=mv^2/r, but not mg+T=mv^2/r (T is the tension of the rope)?

http://tinyurl.com/2qgco5

this is the solution for (b)

http://tinyurl.com/yrl64q

May I know why for centripetal motion, it is mg=mv^2/r, but not mg+T=mv^2/r (T is the tension of the rope)?

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