Car Velocity: Understanding Relative Velocity and its Effects

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The discussion focuses on calculating the relative velocity of two cars moving towards each other at different speeds. The first car's velocity relative to the second is determined to be 142 km/h westward. After passing, their relative velocity remains unchanged. The magnitude of velocity refers to the speed of an object in a specific direction, which is essential for understanding vector quantities in physics. Overall, the conversation emphasizes the importance of both magnitude and direction in analyzing relative motion.
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This is a Question with 3 parts.Any help will be appreciated.Also can you explain what is magnitude of velocity?

1. Two cars approach each other; both cars are
moving westward, one at 76 km/h, the other
at 66 km/h.
What is the magnitude of the velocity of the
first car relative to (in the frame of reference
of) the second car? Answer in units of km/h.
2. What is the direction of the resultant veloc-
ity?
1. eastward
2. Unable to determine.
3. westward
3. TAfter they pass, how will their relative veloc-
ity change?
1. No change.
2. Less than before.
3. Unable to determine.
4. Greater than before.
 
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Velocity is a vector. Every vector can be described by its magnitude and direction relative to some system of axes.
A velocity vector of 10 km/h north-west, for instance, would have a magnitude of 10 km/h and its direction would be 45° relative to the east-west axis.
 
Last edited:
Forget physics. Imagine sitting in the second car and watching the first car, which happens to be faster. What would you see?
 

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