A train starts from station A and attains a velocity of 30m/s in one minute. Then its acceleration is

Question

$\begin{array}{1 1} (a)\; 1 m/s^2 \\ (b)\; 0.5 m/s^2 \\ (c)\; 0.1 m/s^2 \\ (d)\; 0.05 m/s^2 \end{array}$