The angular momentum is "\\bold L = \\bold r \\times \\bold p", and its absolute value is "L = |\\bold r| |\\bold p| \\sin \\theta" , where "\\theta" is the angle between "\\bold r" and "\\bold p". Given that "\\theta = 90^{\\circ}", "L = 0.5 m \\cdot 30 N s \\cdot 1 = 15 N \\cdot m \\cdot s".
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