Which is heavier,100kg of feather or 100kg of coal.请用英文回答

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Which is heavier,100kg of feather or 100kg of coal.请用英文回答

Which is heavier,100kg of feather or 100kg of coal.请用英文回答
Which is heavier,100kg of feather or 100kg of coal.
请用英文回答

Which is heavier,100kg of feather or 100kg of coal.请用英文回答
They are of the same weight.