Two bicycle tires are set rolling with the same initial speed of $3\mathrm{.}90$ m$/$sm$/$s along a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of $40$ psipsi and goes a distance of $17\mathrm{.}2$ mm ; the other is at $105$ psipsi and goes a distance of $92\mathrm{.}9$ mm $.$ Assume that the net horizontal force is due to rolling friction only and take the free$-$fall acceleration to be gg $=9\mathrm{.}80$ m$/$s$2$m$/$s$2.$

Part A

What is the coefficient of rolling friction rr for the tire under low pressure?