Anna needs to move a box of paperback books across the room. If she applies a force of 20 newtons to the box, what is the magnitude of the force exerted by the box on Anna?

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Anna needs to move a box of paperback books across the room. If she applies a force of 20 newtons to the box, what is the magnitude of the force exerted by the box on Anna?

Physics
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According to Newton's third law, any object exerting force against anything will receive the same amount of force that the object is exerting.
Since she applies 20 N of force to the object, the same amount of force, 20 N is being exerted to Anna.
  • rvc
yes it must be 20N

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Other answers:

We have Newton to thank for. So when the apple hit Newton's head newton's head exerted the same force to that apple.
Take this example. On a frictionless surface a boy and a girl are on two different skateboard. When either pushes the other both will move for equal distance from the reference point.
Or let's say there are two people on ice horseplaying and one kicks the other with one food then both guys will move for equal distance assuming no irregularities on ice
20

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