Kicking a Field Goal: Calculating Elevation Angles

[sagaradeath]

Homework Statement

A football kicker can give the ball an initial speed of 30 m/s. What are the (a) least and (b) greatest elevation angles at which he can kick the ball to score a field goal from a point 48 m in front of goalposts whose horizontal bar is 3.44 m above the ground?

Homework Equations

The Attempt at a Solution

 

[tiny-tim]

hi sagaradeath!

show us what you've tried, and where you're stuck, and then we'll know how to help!

 

[sagaradeath]

thatz the thing i don't know how to start it

 

[tiny-tim]

call the angle θ, and use standard constant acceleration equations for the x and y directions (separately)