Top down 2D shooter shell collision with ground

Hi, how do I go about bullet casing colliding with the ground? Since it is a top down game gravity does not apply to the player but bullet casings, grenades and other projectiles do. So basically the casing will collide on the floor where it was ejected.

Any help is appreciated!

You could just provide a coordinate, like if the casing is further than -5 on the x axis, bounce… and destroy. or check for collision, make it a rigid body and the ground as well, add on collision with ground function…add force to the ridid body as necessary if gravity won’t be appropriate.