The time dependence of the rate of the first material

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The time dependence of the rate of the first material point V1 = (at2 + bt) i + yt ^ 3j (m / s), the second law of motion of a material point r2 = yt ^ 4i-at ^ 3j (m). At time t = 1c acceleration points turned perpendicular to each other. At what ratio between the constants is that possible?

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Task 10839. Detailed solution shorthand terms, formulas and laws used in the decision, the withdrawal of the calculation formula and the response.
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