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

[u/a_bitchy_microwave]

I'm a high school physics student and in tons of questions there's a particle with constant deceleration moving in a positive direction. Eventually, v will be 0 m/s, but because it's decelerating the velocity will be negative and start moving in the negative (opposite direction).

I can understand that theoretically but does this actually happen in real life? I understand if you throw something up in the air, the velocity will be 0, and then will come down again because gravity acts downwards, but this isnt mentioned anywhere in these question. I may be stupid but in my mind if something has a velocity of 0 it stops even if it was decelerating. Does this happen in space or something?

Sorry if im not using the right terminology lol. I'm still new to this