In question 26c of the 2015 HSC, the answers expected you to calculate orbital velocity by using Centripetal Force = Gravitational Force and then manipulating the equation in terms of velocity. Can you not just use the formula Orbital V = sqrt(GM/r) that's taught in the course immediately instead of deriving this equation from Fc and Fg?

https://gyazo.com/fe725781429d1fc417b88457b4844ad6

https://gyazo.com/fe725781429d1fc417b88457b4844ad6

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