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a particuler moves along the sides AB,BC,CD of a square of side 25m with a speed of 15m/s. Its average velocity is?

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moved along three sides of square?
say 25 m east, 25/15 s
then 25 m north, 25/15 s
then 25 m west, 25/15 s
so displacement is 25 m north in 75/15 s

25 * 15/75 = 15/3 = 5 m/s north

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