Amazon has started delivering by drone in Lockeford, California, and College Station, Texas. The MK27-2 delivery drone is not very big. So, the packages need to weigh less than 2.27 kg. They need to fit into a box about the size of a shoebox. The drone can fly for 12 km on its own. When it arrives at the customer¡¯s backyard, it will hover at a safe height and drop the package. Amazon hopes to deliver packages within 60 minutes.
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1. What does the drone do when it arrives at a customer¡¯s backyard?