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A runner is jogging in a straight line at a
steady vr= 7.1 km/hr. When the runner is
L= 3.3 km from the finish line, a bird begins
flying straight from the runner to the finish
line at vb= 28.4 km/hr (4 times as fast as
the runner). When the bird reaches the finish
line, it turns around and flies directly back to
the runner.

What cumulative distance does the bird
travel? Even though the bird is a dodo, assume 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.

Sagot :

onyebuchinnaji

The cumulative distance the bird travels is 4.4 km.

Time of motion of the bird

The time of motion of the bird is calculated from the principle of relative velocity.

distance covered by bird - distance of runner = distance between them

vb_t - vr_t = d

(vb - vr)t = d

where;

  • t is the time of motion

(28.4 - 7.1)t = 3.3

21.3t = 3.3

t = 3.3/21.3

t = 0.155 hr

Distance traveled by the bird within this time

d = 0.155 hr  x 28.4 km/h

d = 4.4 km

Learn more about distance traveled by object here: https://brainly.com/question/28032639

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