How to absent "PhysicsVelocity"?

In this page: Struct PhysicsVelocity | Unity Physics | 0.51.1-preview.21
It says: “The velocity of a rigid body. If absent, the rigid body is static.”

So, who can tell me, how to absent “PhysicsVelocity”? Thanks!

how to close this thread? I wrote a new one in the “DOTS Physics”