A runner is jogging in a straight line at a steady Vr= 4.5 km/hr. When the runner is
L= 8.1 km from the finish line, a bird begins
flying straight from the runner to the finish
line at vø= 13.5 km/hr (3 times as fast as
the runner). When the bird reaches the finish
line, it turns around and flies directly back to
the runner.
U
finish
line
What cumulative distance does the bird
travel? Even though the bird is a dodo, as-
sume that it occupies only one point in space
(a "zero" length bird), travels in a straight
line, and that it can turn without loss of
speed.
Answer in units of km.