[填空题]
Huck Finn walks at a speed oxl 8q/o4y- pnby)l; 7jgbsn:mf 0,k*x o;cmf hmiz+ b2vj1i7gh2 .60$ \mathrm{~m} / \mathrm{s}$ across his raft (that is, he walks perpendicular to the raft's motion relative to the shore). The raft is traveling down the Mississippi River at a speed of 1.70$ \mathrm{~m} / \mathrm{s}$ relative to the river bank (Fig. 3-38). What is Huck's velocity (speed and direction) relative to the river bank?Magnitude = Direction = $^{\circ}$
