Question24. (II) A $68-\mathrm{kg}$ snowboarder has an initial velocity of $5.0 \mathrm{~m} / \mathrm{s}$ at the top of a $28^{\circ}$ incline (Fig. 5-37). After sliding down the $110-\mathrm{m}$-long incline (assume a coefficient of kinetic friction $\mu_{\mathrm{k}}=0.18$ ), the snowboarder has attained a velocity $v$. The snowboarder then slides along a flat surface (on which $\left.\mu_{\mathrm{k}}=0.15\right)$ and comes to rest after a distance $x$. Use Newton's second law to find the snowboarder's acceleration while on the incline and while on the flat surface. Then use these accelerations to determine $x$. Ignore air resistance.