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Consider a porter standing on a platform...

Consider a porter standing on a platform with a suitcase which presses his head with a force of 200 N. take this force as action. The reaction force is exerted by

A

the head on the suitcase

B

the earth on the suitcase

C

the earth on the poter

D

the suitcase on the earth

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The correct Answer is:
A
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