Physics - Kinematics Question with Solution | TestHub

$$\begin{array}{rl}\overrightarrow{\mathrm{u}}& =3\hat{\mathrm{i}}+4\hat{\mathrm{j}};\overrightarrow{\mathrm{a}}=0.4\hat{\mathrm{i}}+0.3\hat{\mathrm{j}}\\ \overrightarrow{\mathrm{u}}& =\overrightarrow{\mathrm{u}}+\overrightarrow{\mathrm{a}}\mathrm{t}\\ & =3\hat{\mathrm{i}}+4\hat{\mathrm{j}}+(0.4\hat{\mathrm{i}}+0.3\hat{\mathrm{j}})10=3\hat{i}+\hat{\mathrm{j}}+4\hat{\mathrm{i}}+3\hat{\mathrm{j}}=7\hat{\mathrm{i}}+7\hat{\mathrm{j}}\end{array}$$ Speed is $\sqrt{7^2+7^2}=7\sqrt{2}$ units