Answer:
the height above the ground where the board makes contact with the wall equals 5.297 meters above ground.
Explanation:
The wall and ladder are shown in the attached figure
In the figure we can see that
[tex]cos(28^{o})=\frac{H}{L}\\\\cos(28^{o})=\frac{H}{6}\\\\\therefore H=6.0\times cos(28^{o})==5.297meters[/tex]
