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A point object located at a distance of ...

A point object located at a distance of 15 cm from the pole of concave mirror of focal length 10 cm on its principal axis is moving with velocity `(8hati+11hatj)` cm/s. the velocity of mirror is `(4hati+2hatj)` cm/s. if the speed of the image in cm/s 4k, find the value of k.

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