I need hints for the following (1 Viewer)

[eyeseeyou]

1. Calculate the average gravitational force exerted on a 62kg woman on the surface of the earth (2 marks)
2. On a remote planet, a person of mass 60kg weighs 60N
a)what is the acceleration due to gravity on that planet?
b)If the radius of that planet is 9000km, what is its mass?

 

[BlueGas]

I might be wrong but wouldn't you use F=ma for the first two questions excluding b?

 

[trecex1]

b) you can just apply g=Gm/r^2 since you have g from part a)