The points move along the x axis according to the equations x1 = B1t + C1 ^ -1 and x1 = B2t + C2t ^ 2, where B1 = 1 m / s, C1 = 4 m / s, C2 = 2 m / ssup2 < / sup>. Determine the acceleration of points at the time when the speed of the first of them is zero.
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