v = 72км/год = 20м/с
E(k) = 200Дж
m - ?
E(k) = mv²/2 => m = 2E(k)/v²
m = 2*200/20² = 400/400 = 1кг
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v = 72км/год = 20м/с
E(k) = 200Дж
m - ?
E(k) = mv²/2 => m = 2E(k)/v²
m = 2*200/20² = 400/400 = 1кг