Work done by a force $\mathrm{F}$ on a body is $W=\mathrm{F}.S$, where s is the displacement of body. Given that under a force $\mathbf{F}=(2\hat{\mathrm{i}}+3\hat{\mathrm{j}}+4\hat{\mathrm{k}})$ N a body is displaced from position vector ${\mathbf{r}}_1=(2\hat{\mathbf{i}}+3\hat{\mathbf{j}}+\hat{\mathbf{k}})$ m to the position vector ${\mathbf{r}}_2=(\hat{\mathbf{i}}+\hat{\mathbf{j}}+\hat{\mathbf{k}})$ m. Find the work done by this force.