Physics

Problem

A train moving at

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

is brought to rest by applying brakes and travels

100\,\text{m}

before stopping. Assuming uniform retardation, what is the magnitude of its acceleration? a)

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

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

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

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