Tesla Inc on Thursday unveiled its first pickup Cybertruck, delivering on a promise by Chief Executive Elon Musk to build an electric version of America's favourite vehicle and one that threatens the heart of Detroit automakers' profits.At a launch event in Los Angeles, Tesla Chief Executive Elon Musk said the truck, which looked liked a futuristic armoured vehicle, will have a starting price of $39,900 and a maximum range of 500 plus miles."We need sustainable energy now. If we don't have a pickup truck we can't solve it. The top 3 selling vehicles in America are pickup trucks. To solve sustainable energy, we have to have a pickup truck," he said.