A particle is to move in an xy plane, clockwise around the origin as seen from the positive side of the z axis. In unit-vector notation, what torque acts on the particle at time t = 2.8 s if the magnitude of its angular momentum about the origin is (a)9.8 kg·m2/s, (b)9.8t2 kg·m2/s3, (c)9.8t1/2 kg·m2/s3/2, and (d)9.8/t2 kg·m2*s?

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