A) \[{{0}^{o}}\]
B) \[{{45}^{o}}\]
C) \[{{90}^{o}}\]
D) \[{{180}^{o}}\]
Correct Answer: A
Solution :
The angle between the book (in the downward direction) and the weight of the book (also in the downward direction) is\[{{0}^{o}}\].
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