Why are doors provided with handles near the outer edges, far away from the hinges ?

Why the handles of the doors are at maximum distance from the hinges?

Why are cooking utensils provided with handles made of plastic (or wood) ?

Room are provided with the ventilators near the roof. Why?

The escape speed of a particle on the surface of the earth is 11.2km/second. A body is projectwith thrice this speed from the surface of the earth. What is the speed of the body in the outer space far away from the earth?