Ok. I'm no pilot but isn't it abit stupid for a pilot to try and stop the plane with only 50 percent of the runway left?
I mean the speed of the plane will require more runway to stop and wouldn't the plane just simply go off the runway and crash?
Only if you assume that acceleration and deceleration rates are identical. They aren't. Most vehicles (of any sort) can brake at a higher rate than they can accelerate.