Velocity and acceleration of a particle are $\mathrm{v}=(2\hat{\mathbf{i}}-4\hat{\mathbf{j}})\mathrm{m}/\mathrm{s} and \mathrm{a}=(-2\hat{\mathbf{i}}+4\hat{\mathbf{j}})\mathrm{m}/{\mathrm{s}}^2$. Which type of motion is this?