A place-kicker must kick a football from a point of 36.0 m ( about 40 yards) from the goal.  Half the crowd hopes the ball will clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23.9 m/s at an angle of 51.5 degrees to the horizontal.  So in step 3 use an equation for the  y-component of displacement under constant acceleration to find the height of the ball at this time, where yo is the initial vertical displacement, voy is the initial y-component of velocity, and ay is the vertical acceleration. y=yo+voy^t+1/2ayt^2. Use trigonometry.

University Physics Volume 1
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ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
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Chapter4: Motion In Two And Three Dimensions
Section: Chapter Questions
Problem 8CQ: Answer the following questions for projectile motion on level ground assuming negligible air...
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A place-kicker must kick a football from a point of 36.0 m ( about 40 yards) from the goal.  Half the crowd hopes the ball will clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23.9 m/s at an angle of 51.5 degrees to the horizontal. 

So in step 3 use an equation for the  y-component of displacement under constant acceleration to find the height of the ball at this time, where yo is the initial vertical displacement, voy is the initial y-component of velocity, and ay is the vertical acceleration. y=yo+voy^t+1/2ayt^2. Use trigonometry.

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