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A body of mass 1 kg is moving in a vertical circular path of radius 1 m.

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A body of mass 1 kg is moving in a vertical circular path of radius 1 m. The difference between the kinetic energies at its highest and lowest positions is [Take g = 10 m/s2] 

(A) 20 J 

(B) 10 J 

(C) 4√5 J

(D) 10(√5 -1) J

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Answer is (A) 20 J

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