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Variable names in haskell need to be in small case, but
How to declare variables in .hs file, if we want to store g = 9.8 and G = 6.67300 × 10-11 (in following scenario) ?
Conventionally Physicists mention :
(1) Acceleration due to gravity on earth
g = 9.8 m/sec^2
(2) Universal Gravitational constant
G = 6.67300 × 10-11 m3 kg-1 s-2
You will just have to come up with another name. The distinction between names starting with upper- and lowercase letters is part of the syntax.
While this may be unfortunate in your case, it’s a design trade-off. In order to simplify differentiating between different things (e.g. between variables and constructors), identifiers starting with lowercase letters and ones starting with uppercase letters are fundamentally different.