[填空题]
Two cars approach a streetfwz tp o597nt6 corner at right angles to eac 0lnplm5 gwj:vj4 qsgw3 zdc+/0f9vq*h other (Fig. below). Car 1 travels at a speed re05gl f +lw0jpmj93ncz w/v4g *qsvq:dlative to 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