Red Bull, Williams, Mercedes launch their F1 cars for 2015

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JEREZ, Spain (AP) β€” Red Bull and Williams have launched the Formula One cars they hope will be able to better compete with Mercedes when the new season starts in six weeks’ time.

Red Bull’s RB11 and the Williams FW37 were unveiled Sunday prior to the first day of pre-season testing at the Jerez circuit in southern Spain.

Mercedes, which won the constructors’ championship by nearly 300 points, also launched its W06 on Sunday, with championship runner-up Nico Rosberg later taking the wheel for the first day of testing. F1 champion Lewis Hamilton drives on Monday.

Red Bull finished second overall last year and was the only team to win a race other than Mercedes, with Australian driver Daniel Ricciardo winning three as Sebastian Vettel struggled.

Williams finished third in the constructors’ championship.