a
(a)

\(F-x\) curve is straight line. Equation of \(F\) in terms of \(x\) can be written as

\(F=x \tan \alpha-F_0\)

\(a=\frac{v d v}{d x}=\frac{F}{m}=\frac{x \tan \alpha}{m}-\frac{F_0}{m}\)

Integrating both sides

\(\frac{v^2-x^2}{2}=\frac{x^2 \tan \alpha}{2 m}-\frac{F_0 x}{m}=0\)

\(\frac{x \tan \alpha}{2}=F_0\)

\(x=\frac{2 F_0}{\tan \alpha}\)