An open knife edge of mass ‘m’ is dropped from a height ‘h’ on a wooden floor. If the blade penetrates upto the depth ‘d’ into the wood, the average resistance offered by the wood to the knife edge is
(a) mg (b) mg (1-h/d)
(c) mg (1+h/d) (d) mg(1+h/d)2
Answer: c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a