These are the formulae that will answer any question you have in the world (so long as it is about something moving at a constant acceleration).
You do not need to derive these but it can be useful in helping you to remember them.
When you know the formulae you just have to look at the information an decide which one to use. http://www.ronknott.com/MEI/MechSuvatEquns.html.
This needs practice. Lots of practice.

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