If a stone with an original velocity was of 0 is falling from a ledge and takes 8 seconds to hit the ground what is the final velocity of the stone

What happens to the light rays when they hit the specimen?

Blank liquids and gases exert a buoyant force on objects placed in them

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid