An object of mass m is constrained to move on a horizontal frictionless circular track of radius R. It starts from rest at time t 0 and thereafter is pushed by an external force with constant agnitude F, always horizontal and tangent to the track, The horizontal component of the force exerted by the track on the object is given by А. О В. F C. Ft/mR D. Fa/mR E. F/mg %3D ans: D

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