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N S 31 ST T 1, A car has a mass OF 520kg. What is its mass in toune? 2. A Stone has mass OF 7kg - what is the mass of the Stone in grams. Convert 0.45 tonne i To in to 3, a, kino gram (куз b. gram (g) 4. Convert 4 years into a days (d] b, hours (hr) C, mintis (m)] d, Seconds (se)​