In order to go from her office to her favorite pizzeria for lunch, a woman walks due east (polar angle of 0^ 0 ) an average speed of 3.2 m/s for 5 minutes and then walks due north (polar angle of 90^ o ) for 4 minutes at an average speed of 2.7 m/s . (a) What distance does she walk to get to the pizzeria ? (b) What is the avernge speed for her trip?

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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.