A 5 kg sphere with a radius of 10 cm is thrown along a level surface so that initially it slides with a linear speed of 2 m/s, however does not rotate. As it slides, it begins to spin, and eventually rolls without slipping. How long does it take (in seconds) to begin rolling without slipping? The coefficients of static and kinetic friction among the sphere and the floor are 0.2 and 0.03, respectively.