3. A plane flying due north at 100 m/s is blown by a 500 m/s strong wind due east. What is the plane's resultant velocity? 4. A woman walks 30 m, 30° counter-clockwise from +x-axis, then 40 m, 30° clockwise from -y-axis. (a) Find her displacement from starting point. (b) Compare the magnitude of her displacement with the distance walked. 5. Using the component method, determine the resultant of the following: 8.0 N at 40°, 9.0 N at 120°, and 12 N at 200°, all angles being measured clockwise from the positive x-axis.

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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.