Question

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

Answer 1

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

Answer 2

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.