Question

why is Vegetable knife is sharp

Answer 1

because when its not sharp so we can't cut it
okkkkk

Answer 2

you would have studied that,
PRESSURE=FORCE/AREA
which means that,
pressure is inversely proportional to AREA

so, if the AREA will be less, then the pressure on the object will be more...

so the AREA of the blade of a vegetable knife is kept small so that it applies more pressure on the object is more , even when less pressure is applied

hope this answer helps you
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thank you