Elon Musk unveils Tesla electric truck – and a surprise new sports car

Using diesel trucks now 'economic suicide', says Musk - but questions persist over company's capacity to meet demand

Elon Musk unveiled Tesla's first electric semi-truck on Thursday evening at an event in Los Angeles that also included the surprise reveal of a new Tesla sports car.

The new Roadster, which has the same name as the first electric vehicle produced by Tesla from 2008 to 2012, emerged from the back of one of the trucks at the end of a presentation that focused largely on the economic and performance needs of truck drivers.