the parameters of translation mechanical system are spring constant K, friction coefficient b and mass M
The system variables are the applied force f(t), the displacement y(t), the speed v(t) and the acceleration a(t). the friction
element is given by
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a. f(t)=a v(t)
b. f(t)= b v(t)
c. f(t)= by(t)
d. f(t)= b