i.e. I came across this question a stone is released from rest 22.5 m above the ground and falls vertically before hitting the ground. calculate the velocity of the stone as it hits the ground.
so what do you set the displacement equal to as it hits the ground. -22.5 or 0? because on a previous thread someone said use it in relation to the ground always but if you use 0 you just get 0 but if you use -22.5 you get an answer of 21?