when you are standing on the ground, that is your frame of reference. Anything that you see, watch, or measure will be compared to the reference point of the ground. If you are standing at the back of a moving truck, the truck is now your frame of reference, and everything will be measured, compared to it.
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when you are standing on the ground, that is your frame of reference. Anything that you see, watch, or measure will be compared to the reference point of the ground. If you are standing at the back of a moving truck, the truck is now your frame of reference, and everything will be measured, compared to it.