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Physics 12 Online
OpenStudy (anonymous):

A particle's position is r(vector) =(ct^2−2dt^3)i^+(2ct^2−dt^3)j^, where c and d are positive constants. Find expressions for times t > 0 when the particle is moving in the x-direction. Express your answer in terms of the variables c and d. can anybody walk me through how to even approach this problem? I am totally lost.

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