Answer
See below
Work Step by Step
We are given that $F(s)=\frac{e^{-5s}}{s^2+16}$
Now,$f(t)= L^{-1}[\frac{e^{-5s}}{s^2+16}]\\
=\frac{1}{4}L^{-1}[e^{-5s}(L(\sin 4t))]\\
=\frac{1}{4}\sin 4(t-5)u_5(t)$
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