How Do You Calculate Initial Velocity of an Arrow Shot Straight Up?

[swatmedic05]

You shoot an arrow into the air. Two seconds later (2.00 ) the arrow has gone straight upward to a height of 25.0 above its launch point
What is the initial velocity or the formula I would use to find

 

[LTU83]

Are you looking for max velocity? Initial velocity at what point? Before you shot it would be zero. At max height it would also be zero.

 

[swatmedic05]

the right answer is 22.3 but i don't know how the book got that answer

 

[LTU83]

can you post the entire question.

 

[swatmedic05]

That is the entire question: My homework is on masteringphysics.com

 

[LTU83]

There is not enough information to find the answer.

 

[LTU83]

I apologize I think I just figured it out. Here is the formula
velocity & displacement:
v^2=initial velocity+2(-9.8m/s^2)(25m) but your initial velocity should be zero so are you sure that that is what the question is asking for.