$$B y v^{2}=u^{2}+2 a s$$

$$\left(\frac{u}{3}\right)^{2}=u^{2}-2 a x$$

$$2 a x=u^{2}-\frac{u^{2}}{9}$$

$$2 \mathrm{ax}=\frac{8 \mathrm{u}^{2}}{9}$$ ..... (1)

Similarly from starting

$v^{2}=u^{2}+2 a x$

$0=u^{2}-2 a x_{2}$

$$2 \mathrm{ax}_{2}=\mathrm{u}^{2}$$ ..... (2)

$\mathrm{By}~(1) /(2)$

$$\frac{x}{x_{2}}=\frac{8}{9}$$

$$\frac{24}{x_{2}}=\frac{8}{9}$$

$$\mathrm{x}_{2}=27 \mathrm{~cm}$$