Two displacement vectors when added produce a resultant vector of magnitude 50.0 km pointing 60.00 north of east. One displacement vector is 30.0 km in a direction 40.00 north of west. What is the other displacement vector?     20.0 km in a direction 63.40 north of east      53.7 km in a direction 63.40 north of east       20.0 km in a direction 63.40 north of east      53.7 km in a direction 26.60 north of east

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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.