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  • 07-08-2020
  • Physics
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find it ...............​

find it class=

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MathPhys
MathPhys MathPhys
  • 07-08-2020

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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