Question

Two identical disks, with rotational inertia I(= 1/2 MR2), roll without slipping across a horizontal floor and then up inclines. Disk A rolls up its incline without sliding. On the other hand, disk B rolls up a frictionless incline. Otherwise the inclines are identical. Disk A reaches a height 12 cm above the floor before rolling down again. Disk B reaches a height above the floor of:
A) 24 cm
B) 18 cm
C) 12 cm
D) 8 cm
E) 6 cm

Answer

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