Unidirectional lamina problems

Hi guys,
I’ve got this lamina problem. Maybe you can help me with the solution or even the right approach to this kind of problems?
Thank you!!!
http://d2vlcm61l7u1fs.cloudfront.net/media/6f4/6f4e6064-2442-4518-b6dd-4b7d1757d230/phpsDkA77.png