Once there was a deliveryman
who went in a circle
and made delivery twice
that is how H Bar
got her two pies
\(h=2\pi x.mv\)
\(\hbar=\cfrac{h}{2\pi}=x.mv\)
More importantly, \(h\), \(\hbar\) is dependent on \(x\) and \(v\). In the case when \(v=c\), at light speed, then \(h\), \(\hbar\) is dependent only on \(x\).