The formula for length contraction gives the length of an interval on a ruler moving with velocity
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The formula for length contraction gives the length of an interval on a ruler moving with velocity v relative to an observer as √1 - v2/c2 times the length of the same interval on a ruler at rest with respect to the observer. By what fraction is the length of a meter stick reduced if its velocity relative to you is measured to be 95 percent the speed of light?
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