A light plane attains an airspeed of 460 km/h. The pilot sets out for a destination 800 km to the north but discovers that the plane must be headed 15° east of north to fly there directly. The plane arrives in 1.959 h. What was the i-component of the wind velocity vector (in km/h)?   What was the j-component of the wind velocity vector?

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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.