At t=0 s, a particle of mass 7.68 kg starts from rest at the origin and moves with a velocity = 6.00t²-6.00 +6.00 m/s. (Enter your answers using unit vector notation.) (a) What is the angular momentum of the particle at t=0 s? L= kg-m²/s (b) What is the angular momentum of the particle at t = 0.850 s? L- kg-m²/s

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