$=\sqrt{2 \times 10 \times 9.8} \downarrow$

$=14 m / s \downarrow$

$v _{ f }=\sqrt{2 gh _{ f }}$

$=\sqrt{2 \times 10 \times 5} \uparrow$

$= 1 0 ~ m / s \uparrow$

$\left|\overrightarrow{ a }_{\text {avg }}\right|=\left|\frac{\Delta \overrightarrow{ v }}{\Delta t }\right|=\frac{24}{0.2}=120\,m / s ^2$