I dont understand these questions please help me out

it is asking how far the the water line is

Explanation:

it is asking how far the water line is, just it said, johnny dropped the coin into the well and he waited until it drops in the water, you should measure it, for example, if the coin dropped in the well for 3 seconds then that means the well is 80m, that is just an example it still depends on how much the mass of the coin is

1/0.14nm = 10^10/1.4 a lot

talk back to him about the sport and show him your expertise or leave the room