Applied mechanics question?

http://img85.imageshack.us/img85/9896/appliedmechanicsquestiosr2.jpg I have this quesiton for one of my tutorials in university its in my applied mechanics course. Despite being rushed through a very quick explanation i still dont get it. I know your meant to get out 2 equations or something but i cant seem to... show more http://img85.imageshack.us/img85/9896/appliedmechanicsquestiosr2.jpg

I have this quesiton for one of my tutorials in university its in my applied mechanics course. Despite being rushed through a very quick explanation i still dont get it. I know your meant to get out 2 equations or something but i cant seem to do it. Could someone have an attempt. btw those are the answers down the bottom (in kN)
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