(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Given the following conditions, what is the relative velocity of 2 cars if their ground speeds are 80km/h for Car A and 45 km/h for Car B?

a) both cars are heading in the same direction, A behind B in the reference frame of A

b) Use the reference frame of B for part A)

c) both cars are heading towards each other. take the reference frame of A

d) use B's reference frame for part c.

2. Relevant equations

none. i just used simple addition + subtraction.

3. The attempt at a solution

basically the wording of this problem is really throwing me off. i dont understand what they're trying to ask me to do evne though it seems like an easy question.

im guessing that 35km/h will be the answer for A and B? because i figured if you were sitting in car B, it seems like car A is just going 35 km/h faster..?

please help. thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Relative velocity of two speeding cars

**Physics Forums | Science Articles, Homework Help, Discussion**