Question

A particle is moving in a circle in front of a plane mirror in situation

Answer 1

It depends on the configuration of the position of the particle, like if you keep it like a ring which's axis is parallel to the mirror's axis then it would be like a 2dimensional simple harmonic motion, it could be uniform or non uniform depending upon the motion of circular motion .. but if perpendicular to axis of mirror then you could see a 2dimensional circular motion .. like this tilting the axis will have elliptical kinda motion in mirror and so on .. depending on how you move the mirror or circular ring's axis accordingly