Question

coup
both object and mirror moves away from each other with a speed
20 m/s, then
The speed of the image
1) 60 m/s
2) 80 m/s
3) 40 m/s
4) 20 m/s
7.​

Answer 1

Answer:

I think this should be it

Explanation:

Suppose that at t zero, the object is 10 meters away from the mirror. The image would also be at 10 m, and therefore the image will be 20 meters from the object. At t = 1 second, the object would move 20 meters and the mirror would move 20 meters and the object distance now would be: 10 + 20 + 20 = 50 meters. The image distance would be 50 meters from the mirror and 50 + 50 = 100 m from the object. The image position would have moved 100 - 20 = 80 meters in one second (as measured from the object). Therefore, the speed of the image is 80 m/s