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## Homework Statement

How fast must a meter stick be moving of its length is measured to shrink to 0.500 meters?

## Homework Equations

v/c = sqrt(1 - (1/L)^2) = sqrt(1 - 1/4) = sqrt(3/4) = sqrt(3)/2 or use v = sqrt(3)c/2

## The Attempt at a Solution

(squrt 3c/2) = squrt 450000000 = 21213.203 = 21213.2 km/sec.