A disc of radius R is rolling without slipping on a horizontal surface. Pis a point...

 

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A disc of radius R is rolling without slipping on a horizontal surface. Pis a point at distance æ above its centre O at a certain instant. The radius of curvature of the trajectory of P at that instant is (A) (R+z) (B) R+r (C) (R-z) A disc of radius R is rolling without slipping on a horizontal surface. Pis a point at distance æ above its centre O at a certain instant. The radius of curvature of the trajectory of P at that instant is (A) (R+z) (B) R+r (C) (R-z)