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Question

Consider a porter standing on a platform with a suitcase which presses his head with a force of 200 N. If this force is taken to be action, then the reaction force is exerted by:

A
The head on the suitcase
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B
The earth on the suitcase
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C
The earth on the porter
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D
The suitcase on the earth
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Solution

The correct option is A The head on the suitcase
When the suitcase is pressing the person's head, it is acting a force on his head. As stated by Newton's Third Law of motion, if there is a force, there must be an equal and opposite reaction force. Therefore, the reaction force is applied by the head on the suitcase.

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