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a rectangular block measures 2cm * 1.5cm *1cm .the mass of the object is 31.5 grams .what is its density ?

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density= mass/volume= mass/(2cm*1.5cm*1cm)

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if the block has a length of 5 cm the width is 4cm and the height is 2cm (but the mass is 80 g ) what is the density

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