Why we took 5/18 as speed??
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Actually we know that SI unit of speed or velocity is m/s but generally it is given in km/hr . To convert km/hr to m/s we multiply unit by 5/18
This 5/18 came by :-
1km = 1000m
1 hr = 60 sec
[So 1km/hr = 1000/60 = 5/18]
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