【多选题】A plane figure moves in its plane. The velocity vectors of two different points on the plane figure are the same at a instant. Which statements are correct?
A.
All points in the plane figure have the same velocity at this instant.
B.
All points in the plane figure have the same acceleration at this instant.
C.
The angular acceleration of the plane figure must be zero, but the angular velocity may not be zero at this instant.
D.
The angular velocity of the plane figure must be zero, but the angular acceleration may not be zero at this instant.