1. The problem statement, all variables and given/known data A 1.2 kg object travels with constant velocity (4i - 2j) m/s. When the object is at the point (0 m, 9 m, 0 m), what is the magnitude of its angular momentum about the origin? 2. Relevant equations p = m*v L = r*p 3. The attempt at a solution v = sqrt(4^2 + 2^2) p = m*v = 5.36 L = r*p = 9*5.36 = 48.2 Interestingly the answer I get this way is 2x the right answer. I wonder if this is a coincidence of not. Not sure how to do it the 'right' way.