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Boojho is not sure why we say that the distance of the stone from your hand is the same when we whirl it around. Can you help him understand this? Remember that the stone is held with a string.
 
In motion, the of the object is , even when they rotate. Here, when Boojho tied a thread around a stone and whirled it with his hand, the stone was in  motion. The distance from his hand to the , and the  by itself.