I drop my key off the side of a cliff. At the 5 seconds marks, how fast are the key moving?

477.9264 metres (1568 feet)

Explanation:

Gravity is measured by the acceleration that it gives to freely falling objects. At Earth's surface the acceleration of gravity is about 9.8 metres (32 feet) per second per second. Thus, for every second an object is in free fall, its speed increases by about 9.8 metres per second.

9.8 metres x 5 seconds = 477.9264 metres (1568 feet)

(that's if you use Earths gravity to calculate the keys speed)

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure

gans

explanation:

vestigial organs (like your appendix) are organs that no longer serve a purpose.