A body starts moving from the initial velocity $10\ m/s$ and its velocity becomes $30\ m/s$ in $5\ seconds$. Find the acceleration of the body.

 Here as given initial velocity $u=10$

Final velocity $v=30\ m/s$

Time $t=5\ seconds$

Therefore, the acceleration $a=\frac{v-u}{t}$

$=\frac{30-10}{5}$

$=\frac{20}{5}$

$=4\ m/s^2$