Physics

Problem

A car travels

12\,\text{km}

due north and then

15\,\text{km}

due east in a total time of

1\,\text{h}

. Which option gives the correct pair of values for its average speed and the magnitude of its average velocity? a)

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

and

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

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

and

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

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

and

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

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

and

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