Proportional Controller Calcuation

can some one explain how to Find a proportional gain Kp2 that satisfies the constraints on the velocity error (criterion3). Check,using the Bode diagram, that such proportional gain does not satisfy the remaining design requirements, and graph the tracking error in response to a unit ramp input.


Criterias:
1. the gain crossover frequency ωc should be between ω1 and ω2.

2. the steady-state error should be zero in response to a unit step reference.

3. the velocity constant should be greater than Kv (in other words, the steady-state unit ramp error should be less than 1/Kv).

4. the phase margin should be at least 55 degrees.