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(b) What is the speed of a satellite orbiting at that height?

Note: _e means earth

g = { g_e / [1+(h/R_e)^2] }

At height 0, g = 9.83m/s^2

R = 6400km

I know that we need to isolate "h". I don't quite understand how to start this problem though. Where do we plug in that 10% or what exactly does that 10% mean? I guess the wording of the question is what makes this problem confusing. Help me start this please.