b
Centripetel acceleration \({a_c} = {n^2}R{t^2}\)

\(\begin{gathered}
  {a_c} = \frac{{{v^2}}}{R} = {n^2}R{t^2} \hfill \\
  {v^2} = {n^2}{R^2}{t^2} \hfill \\ 
\end{gathered} \)

\(v = nRt\)

\({a_c} = \,\frac{{dv}}{{dt}} = nR\)

Power \(= M{a_c}v = MnRnRt = M{n^2}{R^2}t.\)