- #1
espo
what is the average acceleration of a car that goes from rest to 59 km h in 9.0 seconds?
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What is the average acceleration of a car
- Thread starter espo
- Start date
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Homework Help Overview
The original poster attempts to determine the average acceleration of a car that accelerates from rest to a speed of 59 km/h over a period of 9.0 seconds. The subject area involves kinematics and the concept of acceleration.
Discussion Character
- Exploratory, Conceptual clarification, Mathematical reasoning
Approaches and Questions Raised
- Participants discuss the definition of acceleration as the change in velocity over time and question the original poster about the specific values for change in velocity and time. There is also a conversion of speed from km/h to m/s mentioned, along with the application of a constant acceleration formula.
Discussion Status
Some participants provide guidance on how to approach the problem without giving a complete solution. There is an acknowledgment of the need to lead the original poster towards understanding rather than providing direct answers.
Contextual Notes
There is a mention of educational norms regarding how to assist students, suggesting that participants are mindful of not providing complete solutions in line with homework expectations.
- #2
Integral
Staff Emeritus
Science Advisor
Homework Helper
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acceleration is definined to be change in velocity per unit time.
What is your change in velocity?
What is your change in time?
Can you take it from there?
What is your change in velocity?
What is your change in time?
Can you take it from there?
- #3
lavalamp
- 278
- 1
First convert 59 Km/h into m/s:
59 * 1000 / 3600 (seconds in an hour) (m in a Km)
59 / 3.6 = 16.4 m/s
Then use the constant acceleration formula:
v = u + at
16.4 = 0 + a*9.0
a = 16.4/9.0
a = 1.82 m/s2
59 * 1000 / 3600 (seconds in an hour) (m in a Km)
59 / 3.6 = 16.4 m/s
Then use the constant acceleration formula:
v = u + at
16.4 = 0 + a*9.0
a = 16.4/9.0
a = 1.82 m/s2
- #4
russ_watters
Mentor
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Generally, lavalamp, we lead them in the right direction and then let them figure it out from there. Thats the way their teachers would want it.
- #5
lavalamp
- 278
- 1
Oops, I'll try and remember that in future. 
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