Destructis

Earth is in danger! This time the threat comes from tons of rusty iron garbage!
Every day there more and more recycled cars on the planet. Piles of scrap metal occupy hundreds of square miles in the dumps of our planet. Ordinary people are not even aware of the impending danger and do not even suppose that somewhere away from noisy cities fierce struggle for the disposal of old cars. We are running out of time, every second s. Its high time we got down to work and helped breaking down the old iron garbage on four wheels!
Please, remember that the force of the blow directly affects the destruction: the stronger you throw the object, the stronger the car is damaged. But not all objects are , so to say, equally useful: some are used to clean the territory, but not to destruct your steel enemy.