College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 2, Problem 25PE
At the end of a race, a runner decelerates from a velocity of 9.00 m/s at a rate of 2.00 m/s2. (a) How far does she travel in the next 5.00 s? (b) What is her final velocity? (c) Evaluate the result. Does it make sense?
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At the end of a race, a runner decelerates from a velocity of 9.00 m/s at a rate of 2.00 m/s. (a) How far does she travel in the next 5.00 s? (b) What is her final velocity? (c) Evaluate the result. Does it make sense?
At the end of a race a runner decelerates from a velocity of 9.20 m/s at a rate of 1.90 m/s2.
(a)
How far in meters does she travel in the next 5.90 s? (Assume the deceleration of 1.90 m/s2 is constant over the full 5.90 s.)
m
(b)
What is her final velocity in m/s?
m/s
(c)
Evaluate the result. Does it make sense?
Now let’s apply our definition of average velocity to a swimming competition. During one heat of a swim meet, a swimmer performs the crawl stroke in a pool 50.0 mm long, as shown in (Figure 1). She swims a length at racing speed, taking 24.0 ss to cover the length of the pool. She then takes twice that time to swim casually back to her starting point. Find (a) her average velocity for each length and (b) her average velocity for the entire swim.
c) If the swimmer could cross a 15 kmkm channel maintaining the same average velocity as for the first 50 mm in the pool, how long would it take?
Chapter 2 Solutions
College Physics
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