Two trains are moving on parallel tracks

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Two trains are moving on parallel tracks. Train A is moving at

15\,\text{m s}^{-1}

and Train B at

30\,\text{m s}^{-1}

. When brakes are applied, each experiences the same uniform retardation of

1.5\,\text{m s}^{-2}

. Find the ratio of their respective stopping distances.