Maintain velocity after impact with kinematic rigidbody

So right now t$$anonymous$$s seems to be working for me but I wanted to check to see if it's the best way to do t$$anonymous$$s. I want to $$anonymous$$t a kinematic rigidbody that tests the collisions to see if the relativeVelocity.magnitude reaches a $$anonymous$$gh enough level to break the object and spawn pieces. If the check passes I want the collider to maintain its velocity after the collision with the kinematic rigidbody...so I'm doing that by directly changing the collider.velocity to the collision.relativeVelocity. Seems to work in my limited testing but I wanted to make sure there's not a better way to do t$$anonymous$$s.

Thanks in advance :)

 var ShaperBlockPrefab : Transform;
 
 function OnCollisionEnter(collision : Collision) {
    if (collision.relativeVelocity.magnitude > 100){
 var spawnPoint : Vector3 = Vector3(transform.position.x, transform.position.y -18, transform.position.z);
 Instantiate (ShaperBlockPrefab, spawnPoint, transform.rotation);
 collision.collider.rigidbody.velocity = collision.relativeVelocity;
 Destroy(gameObject);
 }
 }