Two vectors 
and 
are given by 
and ![]()
style="vertical-align:middle;" src="https://sciemce.com/media/2/ppg__cognero__Chapter_9_Energy_in_Nonisolated_Systems.__media__bf8af0f8-35eb-471f-a479-9b4f159e5328.PNG" data-wiris-created="true" class="Wirisformula" align="middle" />. The scalar product of and a third vector 
is ?16. The scalar product of and is +18. The z component of is 0. What is the magnitude of ?
A. 7.8
B. 6.4
C. 3.6
D. 5.0
E. 4.8
Answer: C
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