If you look at this here page, on the bottom, you will see an area where you can enter 3 variables and it will give you the answer for the 4th variable. It is a good way to check your work. Please do not let yourself fall intot he trap of letting it do your work for you.
http://tutor4physics.com/motion1d.htm
Also this page uses "u" for initial velocity. The sub text button is a little hard to negotiate in html (Finn will probably teach me how later and then I won't say that anymore).
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