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The natural frequency of the system shown in the figure above will increase when

                                        

 

(a) 100 N is increased to 150 N

(b) Stiffness of spring is reduced

(c) Weight is reduced to 50 N and stiffness is reduced to 10 N/cm

(d) Weight is reduced to 50 N and stiffness is increased to 40 N/cm           

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