Q. Light-rail passenger trains that give transportation within and between cities are capable of modest accelerations. The magnitude of the maximum acceleration is typically 1.3 {rm m}/{rm s}^{2}, however the driver will usually maintain a constant acceleration that is less than the maximum. A train travels throughout a congested part of town at 5.0 m/s. Once free of this area, it speeds up to 13 m/s in 8 {rm s}. At the edge of town, driver again accelerates, with the same acceleration, for another 16 {rm s} to reach a higher cruising speed.