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A certain elementary particle has a lifetime of 3.43 ns when it is at rest. (a)...

A certain elementary particle has a lifetime of 3.43 ns when it is at rest.

(a) What is the particle's lifetime as measured by an observer who measures its speed to be 0.949c?

ns

(b) How far does the particle travel during its lifetime as measured by the observer? m

m

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