Rescorla-Wagner model in blocking effect
The value of w1 and w2 at the beginning of the experiment is w1=0 w2=0. The w1 and w2 take this value due to the fact that the learner in this case has not been exposed to the training process (Estes & Skinner, 1941). However, after the training takes places the value of w1 changes with that of w2 is zero since the learner is not exposed to CS2. The value of w1 is
Change in W1 = B(L-W1)
=0.18(0.9)
= 0.162
W2= 0
The value of W1 =0.162 and W2= 0 before the trial. However, after the trial is complete CR no longer changes by a measurable amount from trial to trial. Therefore the values are W1=1 and W2=0.
Since CR no longer changes by a measurable amount from trial to trial. This shows that CS1 =1 and US=0. Therefore, W1= 1 L= 0 and B=0.18
Change in W1 = B(L-W1)
= 0.18(0-1)
=-0.18
W1= (1-0.18)
W1=0.82
Change in W2=- BW2
=-0.18 * 0.82
=-0.1476
Hence W2,
(0.82-01476)= 0.6724
W2=0.6724 and W1= 0.82
At the end of the experiment, where the observation that in spite of the fact that CS2 has been frequently paired with the US (in conditioning phase 2), when presented alone, CS2 elicits little or no CR. When presented by itself, CS1 continues to elicit a conditioned response of strength L. Therefore this shows that
W1>0.82 and W2 =0

Reference
Estes, W.K. & Skinner, B.F. (1941) Some quantitative properties of anxiety. Journal of Experimental Psychology. 29, 390 – 400.