Please answer this constant of proportionality question

Answer:
u = [tex]\frac{k}{s^{3} }[/tex]
Step-by-step explanation:
Since u varies inversely as s³, then
u ∝ [tex]\frac{1}{s^{3} }[/tex]
To convert to an equation multiply by k the constant of variation
u = k × [tex]\frac{1}{s^{3} }[/tex] = [tex]\frac{k}{s^{3} }[/tex]