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2014-12-06T17:16:48+08:00

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Their positions change. If their movements are loco motor, then, their positions with respect to their reference point also changes. Movement is the change of motion and position. It is compared with the reference point and time. (that is just my opinion though)
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2014-12-09T19:17:34+08:00
Form a kinetic energy or move from one place to another
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