Magnitude of a vector with unit

I am having a trouble getting the numerical value of the magnitude of a vector with a unit.

clearvars;
u=symunit;

x=[1 2 3]*(u.m);
norm(x)

ans = 

x=[1 2 3];
norm(x)

ans = 3.7417

x=[1 2 3]*(u.m);
y=[5 6 7]*(u.m);
z=norm(x)/norm(y)

z = 

vpa(z)

ans = 

As it can be seen above, Matlab does not give me the numerical value of the magnitude when units are present.

Answer 1

[Paul]

Looks like simplify pulls the unit^2 out of the root

u=symunit;
x=[1 2 3]*(u.m);
norm(x)

ans = 

simplify(norm(x))

ans = 

vpa(ans)

ans = 

x=[1 2 3]*(u.m);
y=[5 6 7]*(u.m);
z=simplify(norm(x)/norm(y))

z = 

[RH]

Thanks!!!