Car A is driving east on the highway, traveling at 20.98ms. Car B is driving east on the same highway and passes Car A. Car B is traveling at 31.51ms. If you are sitting in Car A, what is the speed of Car B from your frame of reference? Assume the direction east is in the positive direction.   10.53ms   9.35ms   6.54ms   13.33ms   None of these is correct.

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Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.