Question

A plane mirror in y-z plane is moving with - 2 m/s as shown. The object shown now starts moving with
(31 +j-4K) m/s. What is the velocity of the image?
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Answer 1

Answer:

For a plane mirror, 

2vmirror=vobject+vimage

−4i=(3i+j−4k)+vimage

So velocity of image i=−7i−j+4k

Explanation:

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Answer 2

For a plane mirror,

2v

mirror

=v

object

+v

image

−4i=(3i+j−4k)+v

image

So velocity of image i=−7i−j+4k

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