An antelope is at a distance of 29 m from a converging lens of focal length 31 cm. The lens forms an image of the animal. If the antelope runs away from the lens at a speed of 5.2 m/s, how fast (speed) does the image move ? (Give your answer in decimal using mm/s (millimeter per second) as unit)

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An antelope is at a distance of 29 m from a converging lens of focal length 31 cm. The lens forms an image of the animal. If the antelope runs away from the lens at a speed of 5.2 m/s, how fast (speed) does the image move ? (Give your answer in decimal using mm/s (millimeter per second) as unit)

 

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