Direction of acceleration and velocity in 1D

At $t=0$‍, the velocity and acceleration of a particle is $\mathbf{v}=+6{\displaystyle \frac{\text{m}}{\text{s}}}$‍ and $\mathbf{a}=+2{\displaystyle \frac{\text{m}}{{\text{s}}^2}}$‍ respectively.

From $t=0$‍ to $t=t_0$‍, the acceleration decreases from $2{\displaystyle \frac{\text{m}}{{\text{s}}^2}}$‍ to $0.5{\displaystyle \frac{\text{m}}{{\text{s}}^2}}$‍.