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write4u
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(Moderator's Note: this thread was split from https://www.physicsforums.com/threads/no-such-thing-as-instantaneous-speed.800941/)
Does a particle reach its terminal speed instantaneously or not? Specifically a massless photon (restmass). Without mass there is no inertia. Without inertia, how can there be acceleration?
What then prevents a massless particle (such as a photon) from starting at SOL and forces it to consume time in order to accelerate until it reaches SOL?
IMO, length of travel, trajectory, time required are irrelevant to the question.
Does a particle reach its terminal speed instantaneously or not? Specifically a massless photon (restmass). Without mass there is no inertia. Without inertia, how can there be acceleration?
What then prevents a massless particle (such as a photon) from starting at SOL and forces it to consume time in order to accelerate until it reaches SOL?
IMO, length of travel, trajectory, time required are irrelevant to the question.
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