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My work so far is:

stage one:

K1 + U1 = K2 + U2

0.5*mAVa2(squared) = mAgR

Va2 = sqrt(2*g*R) Va2 the speed of mass A on the bottom

stage two:

K1 + U1 = K2 + U2

Mgy2 = 0.5*M*2*g*R where M = 2*m

so y2 = R

The right answer is y2=R/4

I can't see what I am doing wrong or not doing.

Could someone please give me a hint to this problem?