A bar of 30 kg mass is in the rest position for the position θ = 0 °, for which the spring is in its unstretched (relaxed) state. Find the angular velocity of the bar when it is at the position θ = 90 °. Take the acceleration due to gravity as 9.81 m / s ^ 2

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Forced undamped vibrations

In mechanical engineering, vibration is expressed as the term that occurs due to an object's backward and forward movement about a point of equilibrium. Generally, there are three types of vibrations which are,