S = U₁*t₁ + U₂*t₂ = 10 * 10 + 20 * 120 = 2500
U = S/t = 2500 / 130 ~ 19.2 м/с
Объяснение:
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S = U₁*t₁ + U₂*t₂ = 10 * 10 + 20 * 120 = 2500
U = S/t = 2500 / 130 ~ 19.2 м/с
Объяснение: