Can a paticle have
(i) zero speed and non - zero velocity ?
(ii) constant velocity but a varying speed ?
(iii) constant speed but a varying velcoity ?

Explanation

(i) No, if the speed of a body is zero it is at rest, so, velocity is also equal to zero.
(ii) No, speed of the particle is equal to magnitude of its velocity.
(iii) Yes, when a body moves along circular path, covers equal distances in equal intervals of time its speed is constant. But as the direction of motion of the body continuously changes it moves with a variable velocity.