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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
2.5 = 60/v // - 60/v
2.5-(60/v) = 0
2.5-60*v^-1 = 0
-60*v^-1 = -2.5 // : -60
v^-1 = 0.04166667
-1 < 0
1/(v^1) = 0.04166667 // * v^1
1 = 0.04166667*v^1 // : 0.04166667
23.99999808 = v^1
v = 23.99999808
v = 23.99999808
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