1. convert 72km/h to m/s.2. find density of a substance of mass 50 g and volume 50g and volume 2cm³ . 3. convert 20 m/s to km/h.4. find mass of a substance volume5 cm³ and dencity 1.5 g/ cm³. 5 . the volume of substance of mass78.g of dencity 7.8g/ cm³.6. convert 18 g/cm³ to kg / m³. 7 . convert 1600 kg/ m³ to g/cm³. please help me with this problem.
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