A body of mass 𝑚 𝑘𝑔 is rotating in a vertical circle at the end of a string of length 𝑟 metre. The difference in the kinetic energy at the top and bottom of the circle is

Question: A body of mass 𝑚 𝑘𝑔 is rotating in a vertical circle at the end of a string of length 𝑟 metre. The difference in the kinetic energy at the top and bottom of the circle is

(A) \dfrac{mg}{r}

(B) \dfrac{2mg}{r}

(C) 2𝑚𝑔r

(D) 𝑚𝑔r

Answer: option (C)

Solution:

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