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How can a particle move with a constant velocity from rest? I know that the net force on a particle that moves with a constant velocity is zero, so how will it move from rest with a constant velocity if the net force is zero

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    $\begingroup$ Possible duplicate of Moving a charge with constant velocity $\endgroup$ Commented Sep 12, 2018 at 0:56
  • $\begingroup$ @StephenG I don't think it's a duplicate. They're both by the same author; looks like the OP was confused about the answers there and tried to ask a separate question about that. Except this question's a bit unclear... I can't really tell what he's asking. $\endgroup$
    – user191954
    Commented Sep 12, 2018 at 7:07

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For a body to attain a constant velocity starting from zero, at least for a certain time interval a non-zero external force must act on the body in order to accelerate the body from zero velocity to the constant velocity that you are referring to. Once it attains a certain velocity and all the external forces becomes zero, it will continue to move with that certain velocity.

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