Projectile

[RequireComponent(typeof(Rigidbody))]
public class Projectile : MonoBehaviour
{
    [SerializeField] private float _speed = 100f;

    [SerializeField] private Rigidbody _rigidbody;

    private void Reset() =>
        _rigidbody = GetComponent<Rigidbody>();

    public void Setup(Vector3 direction) =>
        transform.forward = direction.normalized;

    private void FixedUpdate() =>
        _rigidbody.velocity = transform.forward * (_speed * Time.deltaTime);
}