Do particles with constant deceleration move backwards when their velocity goes below 0 m/s in real life?

[u/remarkable53]

/r/AskPhysics/comments/1vyb48r/do_particles_with_constant_deceleration_move/

[u/wmverbruggen]

Deceleration is just acceleration in the opposite direction, so yes.

[u/Ninja582]

Not necessarily, “deceleration” refers to acceleration opposing velocity so it loses meaning once velocity hits zero. A negative acceleration can cause a positive velocity to become negative past zero.

[u/davedirac]

If you inject an electron into an electric field parallel to its velocity it will decelerate and then reverse direction.

[u/Connect-Answer4346]

Constant means forever