At one instant, force F = 1.97/ N acts on a 0.472 kg object that has position vector 7 = (4.687 - 4.68A ) m and velocity vector ( - 4.487 + 4.48k ) m/s . About the origin and in unit-vector notation, what are (a) the object's angular momentum and (b) the torque acting on the object? (a) Number 0 A Units N-m (b) Number A Units N.m