[填空题]
Two cars approach a street corner at right angles to each otherfq n5gk9m g46u (Fig. zj4jn34 + -82gq kwjbp: bchm)uxc ls2below). Car 1 travels at a speed relative - cl)qnb :8sg4h jcb 2xup34j2z+j kwmto Earth $v_{1 \mathrm{E}}=35 \mathrm{~km} / \mathrm{h}$ , and car 2 at $v_{2 \mathrm{E}}=55 \mathrm{~km} / \mathrm{h}$ . What is the relative velocity of car 1 as seen by car 2 ? km/h $\theta$$^{\circ} $ West of North
What is the velocity of car 2 relative to car 1 ? km/h $\theta$ $^{\circ} $ south of east