[单选题]
Two boxes of masses m and 2m aretrvxmgn aun93s77k( ; connectc/ m2ujt0tx*t 61rovt xx3 *hav,ot5 ted by a rope. (See Fig. 4-4.) If the for xuctam3 ,xrtt oh j/**0v2tx 16ttov5ward force on the more massive box is F, what is the tension in the connecting rope?
