A force of 5.25 newtons acts on an object of unknown mass at a distance of 6.9..*.108 meters from the center of Earth. To increase the force to 2.5 times its original value, how far should the object be from the center of Earth?

Question

imtiaz7 · Answer

the distance increases

chenping · Answer

I forgot the value of Earth's radius.. is it given in the question? :P

chenping · Answer

Anyway, u gotta see if it's on the surface of earth or longer or shorter than radius of earth, then only apply the potential formula. Using F=GM1M2/r^2 . 
G is gravitational constant
M1 can be mass of Earth. M2 will be the mass of object which is unknown. 
r is distance between them. then using ratio method (cancel both masses since they are the same, just times the Force by 2.5, as stated in the Qs) then u will get the new distance between them :)