The weight of a 75 kg body, 8km above earth surface is 550 Newton. Calculate the gravitational strength at that height

1 answer

weight = m g
so
g = weight/m = 550/75 = 7.33 m/s^2

just for kicks, compute earth radius now

7.33 / 9.81 = Re^2/(Re+8000)^2

.8646 = Re/(Re + 8000)

.8646 Re + 6917 = Re

.1354 Re = 6917

Re = 51086 meters
I do not think so. Maybe you mean 80 km ?