Dear Students as per your requirement regarding explanation of the example (above from book manke). I am uploading this video explaining your few doubts.
Clarification: Note: Since this is type 1 order system ( i.e in Den there is 's') and in this example first corner frequency is w=2 rad/sec . We can plote -20 db/dec for first order sytem till upto only w=2 rad/sec and we can start the plot any where from any value , that should be less than w= 2 rad /sec . In this example the initial slope is started from w=1.
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