[填空题]
Drag-race tires in contact with sec9slc1 8,u (l,bnfl ansk 5s cio,03qni 7v1yy asphalt surface have a very high coefficient of static fni v5s3so1q0kyi7y c ,riction.
Assuming a constant acceleration and no slipping of tires, estimate the coefficient of static friction needed for a drag racer to cover 1.0 km in 12 s , starting from rest.
