A 2.0 kg-book is at rest on the horizontal floor. You are applying a 10 N downward force, on the book, at an angle of 30 o from the vertical. The normal force on the book exerted by the floor is
A) 5.0 N.
B) 10 N.
C) 25 N.
D) 28 N.
E) 30 N.
Correct Answer:
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