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A plane mirro...

Question

A plane mirror in y-z plane is moving with -2i m/s as shown. The object shown has velocity $(3 i + j - 4 k) m / s$ . What is the velocity of the image ?

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Solution

For a plane mirror,
$2 v_{m i r r o r} = v_{o b j e c t} + v_{i m a g e}$
$- 4 i = (3 i + j - 4 k) + v_{i m a g e}$
So velocity of image i $= - 7 i - j + 4 k$

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