At a certain location, a gravitational force with
a magnitude of 350 newtons acts on a 70.-kilogram
astronaut. what is the magnitude of the gravitational
field strength at this location?
(1) 0.20 kg/n (3) 9.8 m/s2
(2) 5.0 n/kg (4) 25 000 n•kg

The unit of gravitational field strength is Nkg^-1 ie N/kg because the formula for Gravitational field strength is g=F/m where F is the gravitational force and m is the mass, and so by process of elimination, the magnitude of the gravitational field strength at this location is:
5.0 N/kg

Idon't get it? what do you mean by playing 17 hours on the wii

A=v^2/r solve for r hope that