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The position of a 2.0-kg block is given by r(t)=0.5cos(@t) î+ 0.5sin(at)j + 0.75k with
@=12 rad/s. What is its angular momentum at t=4s in kg.m²/s?
A) 2.9î + 3.5ĵ + 3k
B) 9.2î - 7.7ĵ
C) 6.0k ID) -5.8î+ 8.2ĵ + 6k
E) 5.8î+ 6.9ĵ+ 6k

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