Jerome places a bag of flour on a scale. the scale shows that the bag has a weight of 17 n. which is the reaction force of the bag sitting on the scale?

a. the scale exerts a 17 n force up on the bag.
b. the scale exerts a 17 n force down on the counter.
c. earth exerts a 17 n force down on the bag.
d. the bag exerts a 17 n force down on the scale.

As per the question Jerome places a bag of flour on a scale.

The scale shows a weight of 17 N.

As per Newton's third law of motion for every action ,there is an equal and opposite reaction which is a fundamental role of physics.

Whenever the bag  will be placed on the scale, the bag will push the scale downward with a force equal to its weight. As per Newton's third law the scale will also provide same amount of force in vertical upward direction which is also the normal reaction of the bag.

Here the weight of bag is 17 N which is the action. Hence the the reaction is also 17 N which is in vertically upward direction.

Hence the option A is correct

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