A pilot is required to fly directly from London, UK, to Rome, Italy in 4.5h. The displacement is 1.7 x 103km [S15o E] A wind is blowing from the west with a velocity of 75 km/hr. Determine the required velocity of the plane relative to the air.

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Q: A light plane flies north from Hamburg to Kiel (100 km) with an air speed of of 340 km/h through…

A: Here we will simply use speed time formula

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.