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Yuki888 [10]
3 years ago
9

Find it ...............​

Physics
1 answer:
Sholpan [36]3 years ago
7 0

Answer:

9 N

Explanation:

Treat X and y as a single book with weight 9 N.

Draw a free body diagram of this book combination.  There are two forces: weight force 9 N pulling down, and normal force F pushing up.

Sum of forces in the y direction:

∑F = ma

F − 9 N = 0

F = 9 N

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