Given, $\text{v}=\text{0}\text{.6}-\text{0}\text{.3}\text{.t}$ (in SI units). Then the initial velocity and acceleration are :

$\text{V}=0.6-0.\text{3T}$

According to the first kinematical equation: $\text{V}=\text{u}+\text{at}$

$\Rightarrow \text{u}=\text{0}\text{.6 m/s}$

$\Rightarrow \mathrm{a}=-{\text{0.3 m/s}}^2$

Therefore, 0.6 ms⁻¹,−0.3 ms⁻² is the correct answer.