Need Help with 1D Kinematics Problems? Here's Step-by-Step Guidance!

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SUMMARY

This discussion focuses on solving two specific 1D kinematics problems. The first problem involves calculating the acceleration of a sports car that travels 115 meters in 5.3 seconds and then decelerates to a stop in 4.0 seconds. The second problem requires determining the height of a cliff from which a rock is dropped, given that the sound of the impact is heard 4.2 seconds later and the speed of sound is 340 m/s. Key calculations involve using the formulas for acceleration and free fall in kinematics.

PREREQUISITES
  • Understanding of basic kinematics concepts, including acceleration and free fall.
  • Familiarity with the equations of motion for constant acceleration.
  • Knowledge of sound speed and its application in calculating distance.
  • Ability to perform unit conversions and basic algebraic manipulations.
NEXT STEPS
  • Study the equations of motion for constant acceleration in detail.
  • Learn how to apply the concept of relative motion in sound problems.
  • Practice solving additional kinematics problems involving acceleration and free fall.
  • Explore real-world applications of kinematics in automotive and physics contexts.
USEFUL FOR

Students studying physics, educators teaching kinematics, and anyone preparing for exams involving motion and acceleration problems.

AbbyGirl
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Hi Guys! I'm having trouble with 2 problems that I only have 1 attempt left to answer correctly so if someone could please just tell me step by step how to complete them that would be great. Thanks to those who help.

Problem 1: A sports car moving at constant speed travels 115 m in 5.3 s. If it then brakes and comes to a stop in 4.0 s, what is its acceleration? Express the answer in terms of g's, where g = 9.80 m/s2. (Take the positive direction to be the direction of travel.)

Problem 2:A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 4.2 s later. If the speed of sound is 340 m/s, how high is the cliff?

Again, thanks a lot.

-Abby
 
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What have you tried so far?

In the first one how fast was the car going? You need that to figure out how fast it decelerates.

What about the second one?
 

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