Two disks disk a and disk b each having the same mass and, Ask an Expert

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Two disks, (Disk A and Disk B) each having the same mass and Inertia of I=1/2MR^2 are rolling on the floor and then up ramps. The ramp for Disk A has friction and it rolls up the ramp 12 cm before rolling back down the ramp. The ramp for Disk B is frictionless.

a) Which disk rolls up the farthest?

b) How much farther does it roll?

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