An open knife edge of mass M is dropped from a height h on a wooden floor. If the blade penetrates S into the wood, the average resistance offered by the wood to the blade is

\[Mg\left( 1+\frac{h}{S} \right)\]

\[mg{{\left( 1+\frac{h}{S} \right)}^{2}}\]

An open knife edge of mass M is dropped from a height h on a wooden fl

1.	An open knife edge of mass M is dropped from a height h on a wooden floor. If the blade penetrates S into the wood, the average resistance offered by the wood to the blade is
A.	\[Mg\]
B.	\[Mg\left( 1+\frac{h}{S} \right)\]
C.	\[Mg(1+hS)\]
D.	\[mg{{\left( 1+\frac{h}{S} \right)}^{2}}\]
E.	None of these
Answer» F.

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An open knife edge of mass M is dropped from a height h on a wooden floor. If the blade penetrates S into the wood, the average resistance offered by the wood to the blade is

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