A particle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to –K/r2, where K is a constant. The total energy of the particle is

 (1) K2r

(2) K2r

(3) Kr

(4) Kr

Concept Videos :-

#5 | Potential Energy
#8 | Relation b/w Potential Energy & Force

Concept Questions :-

Potential energy: Relation with force

(2) Here mv2r=Kr2 ∴ K.E. =12mv2=K2r

U=rF.dr=rKr2dr=Kr

Total energy E=K.E.+P.E.=K2rKr=K2r

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