Pncel sture
11. If \( S(t) \) Is the p6Sfitow of an bly ec(t Mt timet, wheale \( S(t)=5 t^{4}+5 t^{3}+4 t \), Ftnd the AccRepatifn, \( A(t) \)
\[
\begin{array}{l}
V(t)=\frac{25}{2 t}=\frac{2}{\partial t}\left(5 t^{4}+5 t^{3}+4 t\right) \\
V(t)=20 t^{3}+15 t^{2}+4 \\
A(t)=\frac{2 V}{\partial t}=\frac{\partial}{\partial t}\left(20 t^{3}+15 t^{2}+4\right) \\
A(t)=60 t^{2}+36 t
\end{array}
\]
