Question

need help with problems this is what i did so far dont know if its right or not

3.A spherical ball with a radius R=120 cm is thrown on a uniform horizontal lane with initial speed of 9.0 m/s. The ball is thrown in such a way that it skids for a distance before it starts pure rolling. Its motion is purely translational when it first hit the lane. The coefficient of kinetic friction between the ball and the lane is 0.22. (a)For how long the ball skids? (b)How many revolutions does it make before it starts to roll? Note: 1 =(2/5)MR) (7-points)

Answer 1

murt 215 MR? mVoR VIR v = 5vo 7 as- ling =-ug = -0.22x9.0 = -2, 156 tom/22 m t= V-vo こ - 2x 9 - 1.1927 sec 7X62.156) a bi 0 = 1 & ² 이 FR=I2=2, med - 1 x 54g xt 2 2R 1x5X 2.156 2X.12 (1.1927)? 2 = 31.9477 rad 31.9477 reu = 5.08 revolution. 2 TI