A uniform thin ring A of mass m = 7 kg and radius r = 0.5 m is released from rest as shown...

A uniform thin ring A of mass m = 7 kg and radius r = 0.5 m is released from rest as shown and rolls without slip until it meets a step of height ℓ = 0.45 m. Letting β = 12° and assuming that the ring does not rebound off the step or slip relative to it, determine the distance d such that the ring barely makes it over the step.

Figure P8.91