I have a homework but despite all my efforts, I could not. I need help about it. I do not expect exact solution but if you help me I would like to solve and get verification from you.

About the question : I have to get differential equation from this :

quest.jpg

And values for question right here :

M1 = 500KG

M2 = 450KG

m1(t) = 150KG

m2(t) = 120KG

k1 = 20 , b1 = 20

k2 = 10 , b2 = 15

Please help, how to obtain a differential equation from this question ?

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