How fast would javelin normally 25 m long have to be going
How fast would javelin (normally 2.5 m long) have to be going (relative to an observer) to appear 20% shorter? (2 m long)
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a siren at rest has a frequency f0 standing at a crosswalk a student hears a frequency f from the siren in an
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how fast would javelin normally 25 m long have to be going relative to an observer to appear 20 shorter 2 m
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