7. A sphere of mass 10.0 kg and radius 0.25 m (1 = MR') is rolling and its translational speed is 5.0 m/s. The sphere encounters a dip inclined at 30" to the horizontal and which is 15.0 m long (see figure). What is the speed of the sphere at the bottom of the dip? V-5.0 mis a. 18.5 m/R b. 20.7 m/5 15 m 11.4 m/k d 10.1 m/6 c. 121.1 m/s 15 1 5 Sin 30 = 4 = 3-5