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Question

A plane mirror is placed along the x-axis facing negative y-axis. The mirror is fixed. A point object is moving with 3^i+4^j in front of the plane mirror. The relative velocity of image with respect to its object is

A
8^j
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B
8^j
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C
3^i4^j
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D
6^i
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Solution

The correct option is A 8^j
Velocity of object, ¯vob=3^i+4^j
Velocity of image ¯vimage=3^i4^j
Relative velocity of image with respect to its object ¯vrel=¯vimage¯vob=(3^i4^j)(3^i+4^j)=8^j

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