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Imagine a body of mass "m" inside a box of mass "M".Let us assume that box is moving at a constant velocity.Then an observer from outside would see both the body and box moving. Let us now apply a force F on that object and object accelerated by "a". Now if I want to calculate the force from observers perspective. Which mass should I consider "m" or "M"

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    $\begingroup$ Which Object m or M $\endgroup$ – Eli May 23 at 12:51
  • $\begingroup$ Your question is not clear $\endgroup$ – HS Singh May 23 at 13:47
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you will consider M+m as force is applied on both masses and not just any one (assuming that obj means that box)

F =(M+m)a

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