Biologists have studied the running ability of the northern quoll, a marsupial indigenous to australia. in one set of experiments, they studied the maximum speed that quolls could run around a curved path without slipping. one quoll was running at 2.6 m/s around a curve with a radius of 0.80 m when it started to slip. what was the coefficient of static friction between the quails feet and the ground in this trial?