Homework Help: physics

Posted by Alexis on Wednesday, November 7, 2012 at 3:59pm.

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.)

this question is troubling me i guessed 96 ft/s
can someone help me out and explain it thanks so much

physics - Elena, Wednesday, November 7, 2012 at 5:03pm
v₀ =21.82 mi/h, H= 1.60 x 102 ft.
Upward motion
h=v₀²/2g
Downward motion
H+h=v²/2g.
v=sqrt{2g(H+h)}

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