On July 13th, 1977, while driving on a test track, British racer David Purley had a bit of a predicament. The throttle on his car became stuck, and he slammed into a wall at 173 km/hr. He stopped in

 On July 13th, 1977, while driving on a test track, British racer David Purley had a bit of a predicament.  The throttle on his car became stuck, and he slammed into a wall at 173 km/hr.  He stopped in only 0.66 m as his car crumpled against the wall.  Calculate the magnitude of the acceleration experienced by Purley, and express your answer as a multiple of the acceleration due to gravity (this is called the g-force).