[问答题]
Two identical arrows*)k oq;t 7cqxj 5dn4ju, rb u0owftc7),one with twice the speed of the other, are fired into a bale of hay. Assuming the hay exerts a constant frictional force on the arrows, the frc u, tob7w0)faster arrow will penetrate how much farther than the slower arrow? Explain.
