Is this an error in the answer key? Regarding Chapter 2 Dynamics. Thanks.
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Actually, it isn't! Indeed, the weight of an object is apparently different when it is accelerating as result of a force, like when someone is in an elevator!
This previous answer (in French) from the Zone d'entraide might help you understand a bit more clearly:
Explanation from Alloprof
This Explanation was submitted by a member of the Alloprof team.
Thank you for your question!
Actually, it isn't! Indeed, the weight of an object is apparently different when it is accelerating as result of a force, like when someone is in an elevator!
This previous answer (in French) from the Zone d'entraide might help you understand a bit more clearly:
Don't hesitate if you need more help!