Physics

Problem

A student walks 150 m north at

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

and then walks back 150 m south at

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

. Calculate the average speed for the entire walk. a)

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

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

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

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