An object is dropped at a height of 6 m from the ground. how fast is it moving just before it hits the ground?

Iwill give brainliest if you answer right : )

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

How many times did thomas edison mess up the light bulb