t=6.5;
e=91;
es=16;
gama=35*3.141592645/180;
alpha=10.5*3.141592645/180;
r1=100;
g=9.81;
teta=gama-alpha;


options=odeset('AbsTol',1e-30);
[a1,b1]=ode23s('droite1',[0 e-es-r1*teta],0,options)
v2=(2*g*sin(gama)*(e-es-r1*teta))^2
b1(11)
[a2,b2]=ode23s('courbe',[0 gama-alpha],b1(11)/r1^2,options)
[a3,b3]=ode23s('droite3',[0 t],b2(11)*r1^2,options)

vo=sqrt(b3(11))