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**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.