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Ok, so is it correct to say that if [itex] d > \frac{(v_{1}-v_{2})^{2}}{2a} [/itex] there will be no collision, and if [itex] d < \frac{(v_{1}-v_{2})^{2}}{2a} [/itex] there will be a collision (d is distance, v is velocity, and a is acceleration). When I do this, I get that there will be a collision, but the correct answer is that there will be no collision. What am I doing wrong?

Thanks