A point object is moving on the principa...

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 . `9 sec// cm` What is the velocity of the image at that instant

`5 cm// sec `

` 12 cm sec `

` 4 cm // sec `

` 9 cm // sec `

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