How to prove <p> of stationary state = 0

[phys_student]

1. How do I prove <p> of the stationary states of H=(-hbar/2m)d2/dx2 + V(x) is zero?

 

[dextercioby]

That's of course not true, you can however show that its time derivative is 0, i.e. <p> is time independent.