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e.V = 1/2.mv²
1,6.10⁻¹⁹.500 = 1/2.9.10⁻³¹.v²
8000.10⁻¹⁹ = 4,5.10⁻³¹ v²
v² = 8.10⁻¹⁶/4,5.10⁻³¹ = 1,8.10¹⁵ = 18.10¹⁴
v=√18.10¹⁴ = 3√2. 10⁷
Momentum: p = m.v = 9.10⁻³¹.3√2.10⁷ = 27√2.10⁻²⁴ kg.m/s