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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 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

(5)

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