For the given transfer functions, find the response of the system due to the unit step input force \(F(t)=\) \(u(t)\) and zero initial conditions:

(a) \(X(s) / \mathcal{F}(s)=1 /(s+2)\)

(b) \(X(s) / \mathcal{F}(s)=1 /\left(s^{2}+3 s+2\right)\)

(c) \(X(s) / \mathcal{F}(s)=(3 s+2) /\left(s^{2}+3 s+2\right)\).