An object starts from rest and covers a distance of 18 m in 3.0 s. Calculate its acceleration.

The object starts from rest, so its initial velocity is $u = 0 \text{ m/s}$.
The distance covered is $s = 18 \text{ m}$.
The time taken is $t = 3.0 \text{ s}$.

To find the acceleration ($a$) given $u$, $s$, and $t$, we use the kinematic equation:

The acceleration of the object is $4 \text{ m/s}^2$.