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A particle of mass m=0.2kg moves in the xy plane subject to a force such as...

A particle of mass m=0.2kg moves in the xy plane subject to a force such as that its position as a function of time is given by the vector r(t)= (3.0m/s2)t*2i+[12.0m-(2.0m/s*3)t*3]j
what is the magnitude of the torque on the particle about the origin at the moment when the particle reaches the x axis?
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