Physics

Problem

Car X travels due east at

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

while car Y travels due north at

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

. What is the speed of car Y relative to car X? a)

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

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

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

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