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**[SOLVED] Torque and angular momentum for a Particle in a Force Field**

Find A) the torque and B) the angular momentum about the origin at the time t=3 for a particle in a Force Field F=(3t^2 -4t)i + (12t -6)j + (6t - 12t^2)k. Assuming that t=0 is located at the origin.

I equated r"=F then took r X F is this the proper way? Then took r X v to find angular momentum. Any help would be appreciated.