Then we need to convert 800 km/h to m/s which is (2) m/s. Finally we replace in the formula to get m = 2 · 2,100,000,000 / 2 = 85,050 kg = tonnes. Of course, while using our calculator you would not need to perform these unit conversions, as they are handled for you on the fly. Ton vs tonne, tons vs tonnes
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