A) Earth's gravitational pull is 9.8m/s^2, so the mass of the astronaut is 1200N / 9.8 = 122.45kg. The weight of the astronaut is 1100N on Planet X, and so the gravitational potential pull is 1100 / 122.45 = 8.98m/s^2
B) Using s= ut + .5at^2 ... 2.8m = 0 + .5*8.98*t^2
--- From this we can...