Question

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

Answer 1

On Earth, gravity adds 9.8 m/s to the downwsrd speed of any falling object, every second. Beginning from zero downward speed, the speed grows to (8 x 9.8) = 78.4 m/s downward after 8 sec.