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a) For the system of Figure 2:

1) [20 points] how many closed-loop poles are located in the right half-plane, inthe left half-plane, and on the jw-axis. \text { Given the unity feedback system of Figure } 3 \text { with } G(s)=\frac{K(s+4)}{s(s+1.2)(s+2)} Find the following:

The range of K that keeps the system stable. The value of K that makes the system oscillate The frequency of oscillation when K is set to the value that makes the system oscillate.

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