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In a three dimensional coordinate system...

In a three dimensional coordinate system (OXYZ), a concave mirror of radius of curvature 40 cm is placed at x = 80 cm. An object placed at origin is given a velocity `v_(0)` =(9i + 6j+ 3k) cm/s . The magnitude of velocity of its image is given by `sqrt(n cm/s)`, find out the value of n.

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