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Question

A plane mirror is placed parallel to y-axis with its center at origin (0,0,0). An object starts the motion in front of the mirror from position (2,0) m with a velocity (2^i+2^j) m/s. The relative velocity of image with respect to the object is along

A
positive x-axis
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B
positive y-axis
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C
negative y-axis
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D
negative x-axis
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Solution

The correct option is D negative x-axis
Applying vo=(vi), we get the velocity of object and image as shown in above diagram.
vi,o=vivo
or, vi,o=(2^i+2^j)(2^i+2^j)
vi,o=4^i m/s
Relative velocity of image w.r.t object is along negative x-axis.

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