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But If instead of light,he throw a ball then both will see the same speed for the ball always?

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- Thread starter Hepic
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But If instead of light,he throw a ball then both will see the same speed for the ball always?

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PAllen

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Suppose B is moving at v relative to A. Suppose A throws 'something' at velocity u as measured by A. Then B sees the 'something' moving at:

(u-v)/ (1 - uv/c^2)

If you put u=c, you get c also for what B sees. For any other value of u, you get a different speed as observed by B. for u much less than c, this formula becomes empirically indistinguishable from u-v. But it is one formula for all cases.

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