A slender 6-kg rod can rotate in a vertical plane about apivot at B .a spring of constant k=600N/m..

A slender 6-kg rod can rotate in a vertical plane about apivot at B .a spring of constant k=600N/m and an unstreched lengthof 225 mm is attached to the rod asshown. knowing that the rod isreleased from rest in the position shown,determine its angularvelocity after it has rotated through 90o.

 

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