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3 In Lagrangian mechanics, one needs to know the
number of degrees of freedom before solving a
problem. This is the number of independent variables
which are necessary to specify the configuration of any
dynamical system. According to this definition, how
many degrees of freedom does a system of two
particles which are free to move anywhere have?
А. 1
В. 2
С. 3
D. 4
E. 5
F. 6

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