A person applies a constant force vector F on a particle of mass m and finds that the particle moves in a circle of radius r with a uniform speed v as seen from an inertial frame of reference.
(a) This is not possible.
(b) There are other forces on the particle.
(c) The resultant of the other forces is mv2/r towards the centre.
(d) The resultant of the other forces varies in magnitude as well as in direction.
