A particle is to move in an xy plane, clockwise around the origin as seen from the positive side of the axis. In unit-vector notation, what torque acts on the particle if the magnitude of its angular momentum about the origin is a) 4.0 kg m²/s b) +².4.0 kg m²/s³ c) √√4.0 kg m²/s d) 4.0 kg m² s/t²?

A particle is to move in an xy plane, clockwise around the origin as seen from the positive side of the axis. In unit-vector notation, what torque acts on the particle if the magnitude of its angular momentum about the origin is a) 4.0 kg m²/s b) +².4.0 kg m²/s³ c) √√4.0 kg m²/s d) 4.0 kg m² s/t²?