How to make inertial motion in Unity2D?

Question

Unity

In Rigidbody2D gravity is set to 0, mass is 1. When I use velocity, the object just moves, when I use AddForce the object for some reason acquires infinite acceleration and movement. It is necessary for me that this does not happen and the inertia ends after some distance controlled by me after releasing the key.
How to do this?

Answer 1

Need momentum, simple AddForce turns on continuous force, so flies away.
More or less like this:

public float thrust = 1.0f;
public Rigidbody rb;

void Start()
{
        rb = GetComponent<Rigidbody>();
        rb.AddForce(0, 0, thrust, ForceMode.Impulse);
        rb.drag = 0.1f; // Убеждаемся что тело будет постепенно останавливаться.
}

Answer 2

Physics should be known at least in general terms.
With gravity 0, nothing should fall anywhere.