An open knife edge of mass \( m \) is dropped from a height \( h \) on a wooden floor. If the bl...
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1An open knife edge of mass \( m \) is dropped from a height \( h \) on a wooden floor. If the blade penetrates upto the depth \( \mathrm{d} \) into the wood, the average resistance offered by the wood to the knife edge is
(a) math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymim/mimig/mi/math
(b) \( m g\left(1-\frac{h}{d}\right) \)
(c) \( m g\left(1+\frac{h}{d}\right) \)
(d) \( m g\left(1+\frac{h}{d}\right)^{2} \)
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