A plane mirror is moving with velocity 4î + 5j+8ť.
A point object in front of the mirror moves with a
velocity 3i+4j+5k . Here  is along the normal
to the plane mirror and facing towards the object.
The velocity of the image is
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please write the complete question.
you are saying A is perpendicular to plane mirror, but haven't mentioned in the question what is A.
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