gc physics textbook chapter 3 problems (id: d305006c2)

本题目来源于试卷: gc physics textbook chapter 3 problems，类别为 IB物理学

[填空题]
A passenger on a boat movyja e63r;9iy d *hogeg,j:uk. ing at 1+a cs,vm .m*kdj6 o3pl.50$ \mathrm{~m} / \mathrm{s}$ on a still lake walks up a flight of stairs at a speed of 0.50 $\mathrm{~m} / \mathrm{s}$ (Fig. below). The stairs are angled at $45^{\circ}$ pointing in the direction of motion as shown. What is the velocity of the passenger relative to the water?   

参考答案: 1.89±2%


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