For the general case of n masses coupled by n +1 springs, the mass matrix M
1) | is a (n+1) x (n+1) diagonal matrix (i.e. all off-diagonal elements are identically equal to zero). |
2) | is a (n+1) x (n+1) non-diagonal matrix (i.e it has non-zero off-diagonal elements). |
3) | is a (n) x (n) diagonal matrix (i.e. all off-diagonal elements are identically equal to zero). |
4) | is a (n) x (n) non-diagonal matrix (i.e it has non-zero off-diagonal elements). |
The answer is 3)..
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