Free Vibration Analysis of Two degree of Freedom System

If m1= 22 kg, m2= 18 kg, k1= 7 N/m, k2=11 N/m, k3=0 N/m. Then the natural frequencies are:
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If m1= 22 kg, m2= 18 kg, k1= 7 N/m, k2=11 N/m, k3=0 N/m. Then the first and second mode shapes respectively are:
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If m1= m2=20 kg and k1= k2=15 N/m, then the natural frequencies of vibrations are:
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If m1= m2=20 kg, k1= k2=15 N/m and initial excitation x1=2 m and x2=9 m. Then the equation of motion of m1 is:
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If m1= m2=20 kg, k1= k2=15 N/m and initial excitation x1=2 m and x1=9 m. Then the equation of motion of m2 is:
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