# Time dilation

A certain particle has a lifetime of $$1.00 \times 10^{-7} \text{ s}$$ when measured at rest. How far does it go before decaying if its speed was $$0.99$$ $$c$$ when it was created?

The speed of light is $$c = 3 \times 10^8 \text{ m/s.}$$

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