Bukhovtsev-et-al-Problems-in-Elementary-Physics

168 ANSWERS AND SOLUTIONS
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The speed along sides AB and
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'-______ ~ Fig. 275
Be Is
V2 r: u2
VAR=VRC=-2- u+ V V 2_ 2
The speed along sides CD and AD (Fig. 274d)
2
vCD=vDA=-V/ u+ YV - u;
Let us leave only the plus sign before the root in both solutions to preserve
a clockwise direction of the flight. The time required to fly around the square is
t2
4a -(V 2 - ~2
V2_U2
Fig. 276