15. if a particle experiences a force f= i f (where denotes the instantaneous position vector of the particle) the force is identified to be (a) central and con

15. If a particle experiences a force F= i f (where denotes the instantaneous position vector of the particle) the force is identified to be (A) central and conservative (B) non-central and non-conservative (C) non-central and conservative (D) central and non-conservative