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Physics body scaling in Corona SDK

i need to write a code whichs scales the object after it goes through 500 px, i made this code but it doesnt work:

function localScale( event )
  if self.y > 500 then
    self.scale(1.10, 1.10)
  end
end

what is the problem?

You should give

self:scale(1.10,1.10)

Or you can give

self.scale(self,1.10,1.10)

Also, I think when scaling Physics bodies, only the image is scaled. The Physics body is not scaled. So bear that in mind!

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