Convert velocity from kmh−1\text{kmh}^{-1}kmh−1 to ms−1\text{ms}^{-1}ms−1, by multiplying 10003600\frac{1000}{3600}36001000,
72×1000360072 \times \frac{1000}{3600}72×36001000 = 20ms−120\text{ms}^{-1}20ms−1
Therefore, distance covered in 0.4s = 20×0.4=8m20 \times 0.4 = 8\text{m}20×0.4=8m
