slt
bnsba lis9atat
ilakan 3dna sat7 ma2il w lihtikakat mohamala kikon 9ot t2tir sat7 a3modiya 3lih ay iis9at dilha =0.w ama lwznP F I2is9at dyalo imma p=mg*sin& aw P=-mg*sin& 3laha hssab mn7a l7araka, w ila kan 3dna 9wa okhra b7al tawtorat dyal lkit rah kikon imma T aw -T 3lhssab lmn7a dyal haraka wmanha motjihat al9owa
ntaman nkoun fidtak walaw b l9alil hit s3ib anak tfham b had tari9a mais au moin mieu que rien et bon coourageو الله ولي التوفيق [center]