Explanation:
Given : Initial velocity, \({u=20 {~m} / {s}}\)
Distance travelled during the first second of motion will be
\(S = ut + \frac{1}{2}a{t^2}\)
\( \Rightarrow S = 30 \times 1 - \frac{1}{2}g{(1)^2}\,\,\,\,\,\,\,\,\,\,\,\,[\because a = - g]\)
\( \Rightarrow S = 30 - \frac{1}{2} \times 10\)
\( \Rightarrow S = 25\;m{\text{.}}\)
So correct option is (2)