(a) A bus moves 30 km in 30 minutes and the next 30 km in 1 hour. Calculate the average speed for the entire journey. (b) What is reference point?
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(B)A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point. Objects that are fixed relative to Earth – such as a building, a tree, or a sign - make good reference points.
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