A point object is moving on the principal axis of a concave mirror of focal length 24 cm towards the mirror. When it is at a distance of 60 cm from the mirror, its velocity is 9cm/sec. What is the velocity of the image at that instant

(a) 5cm/sec towards the mirror

(b) 4cm/sec towards the mirror

(c) 4cm/sec away from the mirror

(d) 9cm/sec away from the mirror

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