If $S=ut+\frac{1}{2}a{t}^2$ and $u=50$, $a=9.8$, $t=2$ the value of $S$ is

We substitute the given scalar values directly into the kinematic displacement equation:
$$S=(50\times 2)+\frac{1}{2}\times 9.8\times (2{)}^2$$

$$S=100+\frac{1}{2}\times 9.8\times 4$$

$$S=100+9.8\times 2$$

$$S=100+19.6=119.6$$