%% if statement end after else, #look the code again
grav=9.81;
theta=pi/4;
v=20;
x=0; vx=cos(theta).*v;
y=0; vy=sin(theta).*v;
dt=0.05;
for n=1:100
x=x+vx*dt;
vx=vx+vx.*dt;
y=y+vy*dt
vy=vy-grav*dt;
if(y<0); break; end
n=1:10000
if(x==5000);break;
else(x<5000);
v=v+1;
end
end
v
