Posted by **Yash** on Wednesday, September 21, 2011 at 4:29am.

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? -
**Writeacher**, Wednesday, September 21, 2011 at 7:12am
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 -
**bobpursley**, Wednesday, September 21, 2011 at 9:36am
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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