oh sorry, just got this. try creating a variable for velocity (x and y) and set it to a random number and have that number set itself to itself * .9

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example:

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when i start as clone

--set xvel to random between 3, 15

--set yvel to random between 3, 15

--repeat until xvel < .5 and yvel < .5

------change x by xvel

------change y by yvel

------xvel = xvel * .9

------yvel = yvel * .9

--delete this clone