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arildno

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As measured from the Earth frame (in which the spacecraft has the velocity indicated), you'd be measured to have a velocity strictly below c.

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w = (u + v)/ (1 + uv/c

If you define all the velocities in terms of light speed by dividing each one by “c” the formula is simpler and becomes:

w = (u + v)/ (1 + uv)

You’re more accustomed to living and working with speeds less than 0.0005

Where doubling that speed gives you

.001 / 1.00000025

You’ve just never needed the accuracy of dividing by such a small number at those small speeds. And just used the .001 part or (u + v).

But as one of the speeds becomes high, say above .25

Then using the whole formula and dividing becomes important.

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krab

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The .... means the 9's go on forever? That means you are traveling exactly the speed of light. This is impossible, unless, like a photon, you have zero mass.profilexis said:

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