[问答题]
Two identical arrows,lc+,wnv)fos,j ht ;f ; one with twice the speed of the ot fk8 j/p0r*qo n7hwu;ther, are fired into a bale of hay. Assuming the hay exerts a constant frictional force on the arrows, the faster arrow*tru87w;phfn q0 j/ko will penetrate how much farther than the slower arrow? Explain.
