A jetliner travelling northward is landing with a speed of 69m/s . Once the jet touches down it has 750 m of runway in which to reduce its speed to 6.1m/s. Calculate the average acceleration of the plane during the landing .

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Q: magnitude of the acceleration

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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.