



 
Claudette, A unit analysis tells me that the formula should be
otherwise you will not end up with a distance, which is what range represents. Perhaps that is a typo in the text, or that is what you meant to put in. You should be able to see that the value of v does not affect the angle at which R is maximized. Rather, R is maximized when Sin(2x) is maximized. We know that the maximum value of sine is +1. For what value x is sin(2x) = 1? Cheers,
 


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