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1,5 10⁶ = 1/2 1,3 (300² - v₁²) 90
3 10⁶ = 13 9 (9 10⁴ - v₁²)
10⁶ / 39 = 9 10⁴ - v₁²
v₁² = (351 10⁴ - 100 10⁴) /39
v₁² = 251 10⁴ / 39
v₁² = 6,4 10⁴
v₁ = 80√10 m/s
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