A rock is released from rest on a 700 m building and time is 11.95 what is the speed and velocity of the ball just before it hits the ground? I know you have to use the Vf=Vo+at formula but I was wondering why can I not use this formula as well: Vf=Vot+1/2at^2. What's the difference

Answer 1

Oh my !!!
Vf=Vot+1/2at^2. NO !!!!
That is incorrect !
That is DISTANCE not speed
a = - g
v = Vo + a t like that
x = Xo + Vo t + (1/2) a t^2

Answer 2

I sure hope you check this site this morning !

Answer 3

Sorry I did not see this last night. It is important that you understand this. Please check it.
Damon

Answer 4

Thank you!