Car Velocity: Understanding Relative Velocity and its Effects

[blessmeu2000]

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.

 

[RoyalCat]

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.

 

[ideasrule]

Forget physics. Imagine sitting in the second car and watching the first car, which happens to be faster. What would you see?