\( u = 0 \, \text{m/s} \) (starts from rest) \( a = 6 \, \text{m/s}^2 \) Distance Covered in \( n \) Seconds The distance covered in \( n \) seconds is given by: \(d_n = u n + \frac{1}{2} a n^2\) Since \( u = 0 \): \(d_n = \frac{1}{2} a n^2 = \frac{1}{2} \cdot 6 \cdot n^2 = 3n^2\) Calculate Distances Distance covered in the first 2 seconds (\( d_2 \)): \(d_2 = 3(2^2) = 3 \cdot 4 = 12 \, \text{m}\) Distance covered in the first 3 seconds (\( d_3 \)): \(d_3 = 3(3^2) = 3 \cdot 9 = 27 \, \text{m}\) Distance Covered in the Third Second The distance covered in the third second is the difference between the distances: \(\text{Distance in the third second} = d_3 - d_2 = 27 \, \text{m} - 12 \, \text{m} = 15 \, \text{m}\)