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

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The discussion revolves around two 1D kinematics problems needing step-by-step solutions. The first problem involves calculating the acceleration of a sports car that travels 115 m in 5.3 seconds before stopping in 4.0 seconds, requiring the initial speed for accurate deceleration. The second problem asks for the height of a cliff from which a rock is dropped, with the total time until the sound is heard being 4.2 seconds and the speed of sound given as 340 m/s. Participants are encouraged to provide detailed guidance to help solve these problems accurately. The thread emphasizes the importance of understanding initial speeds and the relationship between time, distance, and acceleration in kinematics.
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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