Which of the following to explain why you can lift heavy objects more easily when they are in water

Buoyancy from water. Buoyancy is an upward force on an object immersed in a fluid (i.e., a liquid or a gas), enabling it to float or at least to appear lighter.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000

snell's law

refractve index = sin incidence / sin refraction