1.

An open knife edge of mass 'm is dropped from a height'h' on a wooden floor. If the blade penetrates upto thedepth 'd' into the wood, the average resistance offered by the wood to the knife edge is(O) m 1.(D) mgd(A) mg(B)mgl1--

Answer»

work done by resistive force is F.d , should be equal to change in K.E

and Kinetic energy lost is = mg(h+d)

=> F.d = mg(h+d)=> F = mg(h+d)/d=> F = mg(1+h/d)

option D



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