(1) According to the image, the inverse proportional function image passes through the point (4, 32),

Let the functional relationship between y and s make y= k s,

Then k 4 = 32,

The solution is k= 128,

The functional relationship between y and s is y =128s;

(2) When S = 1.6mm2, Y = 128 1.6 = 80m.