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## Homework Statement

A projectile was fired across level ground at an initial angle of 43.00 degrees above the horizontal. During its flight, it reached a maximum height of 2974 metres. What was the initial speed of this projectile?

## Homework Equations

I assume that the correct equation to use is V

_{y}

^{2}= V

_{0y}² - 2g(y - y

_{0}).

## The Attempt at a Solution

To be honest I'm not even sure how to go about it. Given the equation, I would rearrange for V

_{0y}² however that doesn't seem to work at all. I'm not even sure what the value of V

_{y}has to be. I also suspect the angle comes into play, but I'm not sure what it can tell me. Any pointers greatly appreciated.