\( f(t)=0,25 t^{3}-12 t^{2}+144 t \)
Nullstellen:
\(0,25 t^{3}-12 t^{2}+144 t =0\)
\( t^{3}-48 t^{2}+576 t =0\)
\( t*(t^2-48 t+576) =0\)
\( t_1=0 \)
\(t^2-48 t+576=0\)
\(t^2-48 t=-576\)
\((t-24)^2=-576+24^2=0\)
\( t_2, _3=24\) doppelte Nullstelle (Extremwert)
Extremstellen:
\( f´(t)=0,75 t^{2}-24 t+144 \)
\(0,75 t^{2}-24 t+144=0 \)
\( t_1=8 \) \( f(8)=0,25* 8^{3}-12 *8^{2}+144 *8=512 \frac{m^{3}}{h} \)
\( t_2=24 \) \( f(24)=0,25* 24^{3}-12 *24^{2}+144 *24=0 \frac{m^{3}}{h} \)