Two 1.3 kg masses and three identical springs having a k value of 85 N/m are connected. What are the frequencies of the two longitudinal vibration modes? The two periods?   f=1/2π √(k/m)

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Two 1.3 kg masses and three identical springs having a k value of 85 N/m are connected. What are the frequencies of the two longitudinal vibration
modes? The two periods?
 
f=1/2π √(k/m)

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