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Q2.21:Precise measurements of physical quantities are aneed of science. For example, to ascertain the speedof an aircraft, one must have an accurate method tofind its positions at closely separated instants of time.This was the actual motivation behind the discovery ofradar in World War II. Think of different examples inmodern science where precise measurements oflength, time, mass etc. are needed. Also, wherever youcan, give a quantitative idea of the precision needed

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