A police car starts traveling south, from a position 13 km north of Lawrence, toward Lawrence at the constant speed of 0.5 km/min. It pursues a truck that is traveling east, from a position 2 km east of Lawrence, away from Lawrence at the constant speed 3 km/min (See figure to the right). When is the distance be- tween the two vehicles at a minimum? Y Lawrence Police Car 30 km/h X Truck -> 180 km/h

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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.