Center of MassEasy
Question
A particle is moving along a circle with a constant speed u, as shown in figure. M is a plane mirror, then
Options
A.relative velocity of image w.r.t. object becomes zero twice in one revolution
B.path of image with respect to object is circle
C.path of image with respect to object is straight line
D.speed of image with respect to object when particle is at P is 2u sinθ
Solution
relative speed = 2 usinθ (perpendicular to mirror) 
(b) relative speed = 0 ⇒ θ = 0, 180o since relative velocity is perpendicular to the mirror
(c) ∴ path will be to and fro along a straight line perpendicular to the mirror.
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