Cars A and B approached each other on a straight road from points 550 m apart. It has an initial speed of 75 kph and is decelerating at the rate of 0.40 m/s². B has an initial speed of 20 kph and is accelerating at the rate of 0.35 m/s². a) At what time will the cars be 200 m apart from each other? b) Determine the velocity of A at this instant. c) At what time will the two cars meet each other?

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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.