A drag racer experiences air resistance equal to -cv². Assuming the racer is designed for maximum acceleration, I am to find v[t] and v[x]. If I can just get the equation of motion I'll be set. I think it is F = ma - μmg - cv² = m dv/dt. According to the answer, the book thinks it is F = - μmg - cv². Of course, when I evaluate our answers with the assigned numbers for μ, v, and vt (terminal velocity), we both get imaginary answers. :( I have no clue where we are wrong, but I suppose the books values could be the problem there.