Question

Carl Lewis set a world record for the 100.0-m run with a time of 9.86
s. If, after reaching the finish
line. Mr. Lewis walked directly back to his starting point in 90.9 s, what is the magnitude of his average
velocity for the 200.0 m?
10.14 m/s
1.10 m/s
5.62 m/s
s
11.24 m/s
m
Question 50 (2 points)
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A landing airplane makes contact with the runway with a speed of 78.0 ms and moves toward the
south. After 18.5 seconds, the airplane comes to rest. What is the average acceleration of the airplane
during the landing?​

Answer 1

Given : Lewis set a world record for the 100.0-m run with a time of 9.86

s.  after reaching the finish  line. Mr. Lewis walked directly back to his starting point in 90.9 s,

To Find : magnitude of his average  velocity for the 200.0 m

Solution:

Average Velocity is zero as he reached back at same point hence displacement   = 0  

So  velocity = 0  

Velocity while race = 100/9.86  =  10.14

Velocity while return = -100/90.9  =  -1.1  m/s

Average Speed  = Total Distance / Total Time

= 200/(9.86 + 90.9)

= 200/(100.76)

= 1.985  m/s

Average Velocity = 0 m/s

Average Speed = 1.985  m/s

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Answer 2

Answer:

1.10

Explanation: