(I have a picture of a full explanation saved on my computer and I can show this or recreate using the whiteboard during interview if required.)__Physics__** :** Newton's 2nd Law, 'suvat' equations.

1.Sketch problem.

2.Draw free-body diagram for golf ball.

3.Draw coordinate system.

Newton 2 in horizontal direction leads to expression horizontal distance x = v

Newton 2 + 'suvat' leads to expression vertical distance y = v

Combine to eliminate t and obtain expression y = xtanθ - gx

For minimum clearance of wall path crosses top of wall i.e. point (x=d, y=h). Sub in values for d=20m, h=10m, θ=45°, g=9.8ms