Explanation: \(\text{Hints: } \tan\theta = \frac{v^2}{rg}\) \(\text{Solve: এখানে, } v = 25\text{km/hr} = \frac{25 \times 1000}{3600} \, \text{m/s} = 6.94 \, \text{m/s}\) \(r = 50 \, \text{m}, \, g = 9.8 \, \text{ms}^{-2}\) \(\text{আমরা জানি, } \tan\theta = \frac{v^2}{rg} \implies \theta = \tan^{-1}\left(\frac{v^2}{rg}\right)\) \(\implies \theta = \tan^{-1}\left(\frac{(6.94)^2}{50 \times 9.8}\right) \implies \theta = 5.61^\circ\) \(\text{Ans. (C)}\)