A point object is moving with velocity 6...

A point object is moving with velocity `6 i+j+2 k` (m/s)in front of a plane mirror whose refiecting side is `x z` -planc. If the mirror also moves with a velocity `hat(i) -hat(j)` (m/s), then what is the speed (in m/s ) of the image? (Round-off the answer to nearest integer)

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