Here are splits from MJ's 400 world record. Are the last 3 from a flying start? I guess they'd have to be. Seems slow, though.
That he did, powering away from the field down the final straightaway as the
crowd of 41,515 stood and cheered.
Johnson's splits for each 100 were approximately 10.9, 10.1, 11.3 and 11.9.