The tools meant for cutting are always have sharp edges because

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a sharper side of a tool can cut more easily than a blunt side of it

The sharp side of the tool has a smaller contact area

When same amount of force is applied on it, the sharp side of tool exerts more pressure than the blunt side

All the above

answer is D.

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Detailed Solution

A sharp side of a knife cut more easily than a blunt side of it because sharp knife of a side has a smaller contact area.
$\begin{array}{l} P = \frac{F}{A} \\ P \propto \frac{1}{A} \end{array}$

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