Question: Look at figure 1.6. if Car a slowed to 30m/s. what would the velocity of car b relative to car a be? figure 1.6 is a picture of 2 car going forward the same way. Car a is in the front and car b is in the back. Car a is going at 40m/s and car b is going 60 m/s. will this be how i solve it? 40m/s - 60m/s = -20 m/s is that how the answer is or i'm i wrong? is it another way?