Posted by Alexis on .
If an object is thrown in an upward direction from the top of a building 1.60 x 102 ft. high at an initial velocity of 21.82 mi/h, what is its final velocity when it hits the ground? (Disregard wind resistance. Round answer to nearest whole number and do not reflect negative direction in your answer.)
I guessed 96 ft/s, would someone please show me what equation to use as well as the answer so I can understand how to do it? Please and thank you

Physics 
bobpursley,
You guessed? That is a silly thing to do.
vf^2=vi^2+2ah
a=9.8m/s^2 h=1.60E2