The normal force
a. is never included in an FBD if there is an upward acceleration
b. p...
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The normal force
a. is never included in an FBD if there is an upward acceleration
b. points upward on an FBD for all objects
c. must be included in the FBD for any object near the Earth's surface
d. is included in an FBD if the object is in contact with a surface​
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