Question

A 3.00 lb. physics book rests on an ordinary scale that is placed on a horizontal table.

The reaction force to the downward 3.00 lb force on the book is

A. an upward 3.00 lb force on the scale due to the table.
B.an upward 3.00 lb force on the book due to the scale.
C.an upward 3.00 lb force on the table due to the floor.
D.an upward 3.00 lb force on the earth due to the book.

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