本题目来源于试卷: gc physics textbook chapter 3 problems，类别为 IB物理学
[问答题]
A car is driven 215 km west and theii.3 ry/f7uura8rdd:j9db ;vh j l adf5s8w*;n 85 km southwest. What ic 0de 9-2ar m 0yfjf/w:tbs;vxs the displacement of the car from the point of origin (magnitude and directib-r e jacs9 y:x20d mf0vtw/;fon)? 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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