Motion of Two Cars: Velocity Calculation in Same Direction - 1 km/h

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Homework Help Overview

The problem involves calculating the relative velocity of two cars, a Ford and a Holden, traveling in the same direction at different speeds. The original poster expresses confusion about the calculation, initially summing the speeds instead of finding the difference.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the appropriate method for calculating relative velocity, questioning whether to add the speeds or consider the difference. Some suggest visualizing the scenario to aid understanding.

Discussion Status

The discussion is exploring different interpretations of how to approach the problem. Some participants are providing guidance on how to think about relative motion, particularly in terms of visualizing the situation from one car's perspective.

Contextual Notes

There is an underlying assumption about the definition of relative velocity and how it applies when two objects are moving in the same direction. The original poster's confusion highlights a potential misunderstanding of vector addition in this context.

missmerisha
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Homework Statement



A ford is traveling at 59 km/h while a Holden has a speed of 60 km/h

Calculate the velocity of the Holden relative to the Ford when they are traveling in:

in the same direction

The Attempt at a Solution



59+60 = 119 km/h

However the answer is 1 km/h.

I don't understand why it's 60-59 km/h
 
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Have you drawn out this problem? It's pretty easy to figure out.
 
there are two vectors 59 km/h and 60km/h
and they're traveling in the same direction.
Shouldn't you add the two vectors?
 
missmerisha said:
Calculate the velocity of the Holden relative to the Ford when they are traveling in:

If you want to know the velocity of the two cars relative to one another, what is the proper way to handle the vectors. Put it this way. If you were driving one car and looking at the the other car, what would you see the other car doing?
 

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