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Speed is the distance an object travels in a unit of time. You can calculate speed with this equation S=D/T. Average speed in the distance divided by the time. The speed of an object at one instant time is the objects instantaneous speed. Average speed is the speed that you are going for a long time. Instantaneous is the speed that you are going at that moment. A real world example of theses would be driving cars.
Everything is always in motion. You are in motion when you run. The pic on the right that car is in motion. Relative motion is when an object changes it position from one place to another. Like when you kick a soccer ball. The ball is changing position. Velocity is the rate at which the object changes position.
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