l = V₀t + at²/2
V₀ = l - at²/2 / t = 100 - 0.3 * 400 / 2 / 20 = 2 м/с
V = V₀ + at = 2 + 0.3 * 20 = 8 м/с
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l = V₀t + at²/2
V₀ = l - at²/2 / t = 100 - 0.3 * 400 / 2 / 20 = 2 м/с
V = V₀ + at = 2 + 0.3 * 20 = 8 м/с