Question 1147470
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Velocity is the first derivative of the coordinate function over time.


For the first  particle, velocity is  {{{v[1]}}} = 4 - 6t.


For the second particle, velocity is  {{{v[2]}}} = 2t - 2.


Two particles have the same velocity when  {{{v[1]}}} = {{{v[2]}}},   or


    4 - 6t = 2t - 2.


From this equation find "t".


It will be your answer.
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Happy learning (!)