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F_{net}=M_{1}g+M_{2}g+D_{1}+D_{2}=(M_{1}+M_{2})a_{net}\\ a_{net}=\frac{D_{1}+D_{2}}{M_{1}+M_{2}}+g |
Here, N is N is the normal force, which represents the interaction between the two sections. If N is negative, there will be drag separation (nothing will be holding the sections together).
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