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Question

What is the famous relation in physics which relates 'moving mass' m to the ' rest mass ' m0 of particle in terms of its speed v and the speed of light c. (this relation first arose as a consequence of special relativity)

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Solution

We know that,

m0m=1v2

Left hand side is dimensionless.

Therefore, right hand side should also be dimensionless

If is possible only when 1v2 should be 1v2c2

Thus, the correct formula is

m=m0(1v2c2)12


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