Relative velocity of 2 vehicles

In summary, the conversation discusses the calculation of the velocity of vehicle A relative to the velocity of vehicle B. The equation aVb = Va - Vb is used to calculate this velocity, with Vb representing the velocity of vehicle B and Va representing the velocity of vehicle A. An example is given to explain the concept of relative velocity, where if one car is overtaken by another car, then relative to the faster car, the slower car is going backwards.
  • #1
Aashish Bharat
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Two vehicles leave simultaneously from a fork in a road. Vehicle A travels at a velocity of 85 km/h north-east. Vehicle B travels at 104 km/h directly east. Calculate the velocity of vehicle A relative to the velocity of vehicle B.

Answer (from memorandum): http://imgur.com/a/L0prH

I do not understand why is Vehicle B traveling west, an explanation on how why this was done would be appreciated!

aVb = Va - Vb (Velocity of A relative to velocity of B) when do you use this equation?
 
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  • #2
If you are in a car and get overtaken by another car, then relative to the faster car you are going backwards. Not so?
 
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Likes Aashish Bharat
  • #3
PeroK said:
If you are in a car and get overtaken by another car, then relative to the faster car you are going backwards. Not so?
Damn it, they took the opposite direction of Vb from the equation aVb = Va - Vb. I should have known better
 

What is relative velocity?

Relative velocity is the velocity of an object or vehicle relative to another object or vehicle. It is the difference between the velocities of the two objects.

How is relative velocity calculated?

Relative velocity can be calculated by finding the difference between the velocities of the two objects. It is important to consider the direction of motion when calculating relative velocity.

What factors affect the relative velocity of two vehicles?

The relative velocity of two vehicles can be affected by the velocities and directions of both vehicles, as well as the distance between them and any external forces, such as wind or gravity.

Can relative velocity be negative?

Yes, relative velocity can be negative. This means that the two objects are moving in opposite directions, and the relative velocity is the difference between their velocities in those opposite directions.

Why is understanding relative velocity important for driving?

Understanding relative velocity is important for driving because it allows drivers to anticipate the movement and potential collisions with other vehicles. It also helps with calculating the necessary distance for safe braking and passing.

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