Class Hierarchy: Vehicle (base class) - Motorized (child of Vehicle) - Truck (child of Motorized)

Database tables - putting the Vehicle fields in Motorized table but keeping Motorized and Truck as separate tables:
Motorized - has Vehicle fields
Truck - FK to Motorized

Is there a way to do this using JPA?

e.g. such that the following can be used:

EntityManager em = factory.createEntityManager();

Query q = em.createQuery("select v from Vehicle");
List<Vehicle> vehicles = q.getResultList();

// Can polymorphism be achieved with the find method?
Vehicle vehicle = em.find(Vehicle.class, 123);