Physics

Problem

A train is travelling at

72\,\text{km h}^{-1}

when the driver applies the brakes and the train comes to rest in

400\,\text{m}

. Calculate the magnitude of the uniform deceleration produced by the brakes. a)

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

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

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

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