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**Flat Earth Debate / Re: Falling objects?**

« **on:**May 31, 2016, 09:36:41 AM »

This is relativity we are talking about, you can have things both ways if you look at it from different reference frames.

In special relativity you can't just add velocities normally, because imagine you have an object A and two ships, both moving away from A at 70% of the speed of light, but in opposite directions, what speed are the two ships moving away from each other, it's not 140% of the speed of light. The correct formula to add velocitys is (u+v)/(1+(uv/c*c)).

Now this formula means that you can't add two velocities below c and get something above c, now since the UA model says the earth is accelerating at 9.81ms-2, this means that each second the speed is being increased by a value below c, and as you can see from the formula that if you increase the speed of an object by an amount less than c, it will never end up larger than c.

To sum up, something can be constantly accelerating and never get faster than c because adding velocities is weird.

Now if you want a real flaw, considered the fact that gravity varies across the planet, so acceleration upwards has to vary, meaning the planet would of teared apart.

In the real world, I absolutely agree with you. But this is the UA we're refering to here, where only select parts of special relativity are considered valid, and not only that, but the underpinning effects of spacetime itself are gutted. In their model, where the force everyone else considers gravity is caused by acceleration and not mass, would allow for speeds to reach c...that's the biggest flaw, at least in my opinion.