A object is moving towards a fixed conca...

A object is moving towards a fixed concave mirror of focal length f = 1 m.along the principal axis of the mirror With a velocity `5 m//s` when its distance is just 9m. The average velocity of image will be

`1/5m//s`

`1/10m//s`

`5/9m//s`

`4/10m//s`

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