0.85*v²/2*9.8
this is the correct interpretation
\(\frac{0.85*v²}{2}*9.8 =\frac{0.85*9.8}{2} v² = 4.165v^2\)
or maybe you really meant
0.85*v²/(2*9.8)
\(\frac{0.85v^2}{2*9.8}=\frac{0.85}{2*9.8}*v^2\)
0.85/(2*9.8)v^2 = 0.0433673469387755v^2
