Acceleration of a runner to finish in his desired time

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SUMMARY

The discussion focuses on calculating the time required for a runner to accelerate in order to complete a 10,000 meter run in under 30 minutes. After 25 minutes, the runner has 1900 meters remaining and must accelerate at 0.22 m/s². The initial velocity at 25 minutes is 5.4 m/s, and the final velocity needed to cover the remaining distance in the desired time is 6.33 m/s. Using the SUVAT equations, the time taken to accelerate can be determined based on the change in velocity and distance remaining.

PREREQUISITES
  • Understanding of kinematic equations (SUVAT)
  • Basic knowledge of acceleration and velocity concepts
  • Ability to perform calculations involving time, distance, and speed
  • Familiarity with units of measurement in physics (meters, seconds)
NEXT STEPS
  • Study the SUVAT equations in detail to solve motion problems
  • Learn how to calculate average acceleration and its implications in real-world scenarios
  • Explore examples of motion problems involving constant acceleration
  • Practice solving problems related to speed and distance in various contexts
USEFUL FOR

This discussion is beneficial for students studying physics, particularly those focusing on kinematics, as well as athletes and coaches interested in understanding the dynamics of running performance.

Pioneer98
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Homework Statement



A runner hopes to complete the 10,000 meter run in less than 30 minutes, after exactly 25 minutes there are 1900 meters to go. The runner must then accelerate at 0.22 m/s^2 for how many seconds in order to achieve the desired time?

Homework Equations



V=change in distance/change intime
avg acceleration=change in velocity/time elapsed


The Attempt at a Solution



V before 25 minutes=5.4 m/s
V after 25 minutes=6.33 m/s
Avg. Acceleration=.24 seconds (know that's not right)
 
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V before 25 minutes=5.4 m/s=Correct
Question is what is time taken
Acceleration given.

Now we call it u not V
You have intial velocity 5.4 m/s, distance to cover and use SUVAT to find time needed.
 
The runner accelerates steadily at 0.22m/s over a time t seconds. Then he runs at that new speed for 300-t seconds.
 

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