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
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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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