Answer:
I would say a pond
Explanation:
A pond is more still than an ocean, therefore you could see your reflection better
Object height 10cm is placed in front of plane mirror. The height of the image will also be 10cm as the height of image is same as height of object in the case of plane mirror
The mass would be the same
47kg on the moon as well
Sorry, I don't know but I think the correct answer is the first option.
