本题目来源于试卷: gc physics textbook chapter 3 problems，类别为 IB数学
[问答题]
A car is driven 215 km uz 2jjtuk*33h west and then 85 km southwest. What is th h5e01dh 8dqo8fkg 9ki4bvn/o e displacement of the car from the point of orik /0 b94 ikonhd8h8 f1gevoqd5gin (magnitude and direction)? Draw a diagram.
参考答案: displacement is 215+85$ \cos 45^{\circ}=275.1 \mathrm{~km}$ and the south displacement is $85 \sin 45^{\circ}=60.1 \mathrm{~km}$ . The resultant displacement has a magnitude of $\sqrt{275.1^{2}+60.1^{2}}=281.6 \mathrm{~km} \approx 282 \mathrm{~km}$ . The direction is $ \theta=\tan ^{-1} 60.1 / 275.1=12.3^{\circ} \approx 12^{\circ} $ south of west. 
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