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Yes! They both have a mass of 1 kg, so, they will be equally heavy. The mass of an object is thus related to its weight, or its 'heaviness'.
We also said that matter is something that occupies space. All objects we see in our everyday life occupy space. There are other things like air that are not visible, but, still occupy space.
What about a shadow? Does it occupy space?
  • Yes
  • No