Suppose the vertical coordinates y of the center of mass (CM) of a falling object at different time t are recorded as in Table 1. Estimate the vertical velocity and acceleration of the object at time t = 0:2

\begin{tabular}{l|ccc} \hline \hlinet[s] & 0.1 & 0.2 & 0.3 \\ \hliney[m] & 0.05 & 0.21 & 0.44 \\ \hline \hline \end{tabular}