In the Mississippi river banks in Louisiana, a tug boat leaves a harbor and sails 5.0 km in the direction 45 degrees south of east, where the captain stops to pick up a small load of crabs. A short time later, the boat sails 1.0 km in the direction west. What is the magnitude and direction of the resultant displacement from the harbor?

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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.