http://i634.photobucket.com/albums/uu67/cosmos1328/pure/594633.jpg
更新1:
sorry, the link is as follow: http://i634.photobucket.com/albums/uu67/cosmos1328/1248576.jpg
更新2:
its a mc question (from past paper) hope someone could solve it =]
更新3:
but why doesn't the force acting on mass B is F/2 ?? I think each of the 2 springs is stretched by force F/2. what's wrong with me? plz tell me=]
