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model SpringMassTest
parameter Real M = 1;
parameter Real k = 1; //Spring Constant
parameter Real b = 10;//Damping Coeff
Real vel;
Real dist;
Real Force = if time > 10 and time < 11 then 105 else 100;
equation
Force = M * der(vel) + k*dist + b*vel;
vel = der(dist);
end SpringMassTest;
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