Explanation: \( \text{Hints: } v = \int a \, dt; \, s = \int v \, dt \) \(\text{Solve: } v = \int a \, dt = \int (2 + 6t) \, dt = \int 2 \, dt + \int 6t \, dt\) \[v = 2t + 3t^2\] \[s = \int v \, dt = \int (2t + 3t^2) \, dt = \int 2t \, dt + \int 3t^2 \, dt\] \[s = 2 \cdot \frac{t^2}{2} + 3 \cdot \frac{t^3}{3} = t^2 + t^3\] \[\text{At } t = 10 \, \text{sec, } s = 10^2 + 10^3 = 100 + 1000 = 1100 \, \mathrm{m}\] \(\text{Ans. (D)}\)