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## Homework Statement

A football kicker can give the ball an initial speed of 27 m/s. He is 54 m from the goalpost which has a crossbar 3.37 m high.

(a) What is the largest angle of elevation that he can kick the football and score a field goal?

(b) What is the smaller angle of elevation that he can kick the football and score a field goal?

## Homework Equations

rf=r0 + vdeltat

rf=ri+vot+1/2at^2

## The Attempt at a Solution

I'm confused about where to begin this problem ,considering that I don't have time.

Would I do something like:

rf-ri= 27sintheta, but then I would need the change in time, which is not given.

Any thoughts on how to solve this problem?