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An open knife edge of mass 200g is dropped from hieght 5m on a cardboard. If the knife edge penetrates 2m into the cardboard, the average resistance offered by the cardboard to the knife

  • Math? Science?? What? -

    Please type your subject in the School Subject box. Any other words, including obscure abbreviations, are likely to delay responses from a teacher who knows that subject well.

  • Choudhary -

    Force*distance= work
    force*2=.2*g*5 (the potentialenergy of the knife at 5 meters)

    force= 50*g Newtons
    this is pretty lame cardboard.

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