Question

one has to keep the edge of a knife very sharp to out vegatable why is it so.

Answer 1

because if the surface area of knife is broad then it require more pressure and vices versa

Answer 2

hey user here is your answer:-

>>>> sharp edge knife exerts more pressure and vice-versa on object in comparison of blunt knife . when more pressure is exerted then the knife easily cuts vegetables .So , one has to keep the edge of a knife very sharp to cut out vegetables .

hope it helps you !!!
mark as brainliest if sufficient .