by mathspete » Thu Jun 10, 2021 11:08 pm
The different divisor numbers must be due to different values of 'g' the acceleration due to gravity. The K.E. formula of half m times v squared needs the mass in pounds so the weight in grains needs to be divided by 7000 and the value of 'g', which I took as 32. Whichever formula is used the difference is less than half of one percent, so hardly worth bothering about
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