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## Homework Statement

When at rest, the Sigma- particle has a lifetime of 0.15 ns before it decays into a neutron and a pion. One particular Sigma- particle is observed to travel 3.2 cm in the lab before decaying.

What was its speed? (Hint: Its speed was not 2/3 c)

## Homework Equations

V=x/t

## The Attempt at a Solution

V=x/t

V=.032m/.15*10^-9s=2.1333*10^8

Since it wants the answer in terms of the speed of light c,

2.1333*10^8 / 3*10^8 = .7111c

This isn't the right answer though, help please :)

EDIT: I just realized that v=x/t^2, but that gives me an implausible answer of 4740740741c, so I still need help