How do i make a ball slowly decrease speed?

I tried to lower the friction on the rigibody so then it could slow down causally but it didn’t and i’m not good at c# coding either. So i just got stuck with the ball staying at the same speed rolling of the plane.,I tried lowering the rigibody’s friction but it would still roll all over the map.

you’d have to increase linear drag, i believe, or manually set the velocity to decrease each frame.