Selecting objects with velocity

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I have a simulation of ground breaking. I want to delete the objects with no velocity. What expression should I put in Delete By Expression box?
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abs(length($VX)) + abs(length(VY)) + abs(length(VZ))== 0

this probably inst all necessary but it will work. (very tired )
.
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length($VX,$VY,$VZ) == 0
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Thank you zdimaria and pinkwerks.
Both the expressions are working.
Thanks a lot.
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