how to destroy the game object in certain position in 2D?

The game object is a bike or a car it has wheels. when the wheels on the ground, the object should move.
when it is in air and fall down on the ground improperly. that means severely. the game object should destroy…How can I do that? Maybe I need a script. Help me,

please…

refer to this image the object falls like this it should destroy.

You could create an empty GameObject with a colider that is parented to the the Rider GameObject.
Give this empty GameObject a collider which is at the area of the car which shouldn´t touchthe ground.
Than add a script which detects the collision with, in this case, the purpil line.