An airplane maintains a speed of 630 km/h relative to theair it is flying through, as it makes a trip to a city 750 km awayto the north. (a) What time interval is required for the tripif the plane flies through a headwind blowing at 35.0 km/htoward the south? (b) What time interval is required if thereis a tailwind with the same speed? (c) What time interval isrequired if there is a crosswind blowing at 35.0 km/h to theeast relative to the ground?

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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.