1. The problem statement, all variables and given/known data A spaceship lifts off vertically from the Moon, where g = 1.6 m/s2. If the ship has an upward acceleration of 1.0 m/s2 as it lifts off, what is the magnitude of the force exerted by the ship on its pilot, who weighs 735 N on Earth? From Halliday, Fundamentals of Physics, 9e 2. Relevant equations Newton's Second Law: F(net)= ma 3. The attempt at a solution I'm more looking for an explanation on why the answer is 195 N. Granted I can see that they added the two forces. (75kg*1.0m/s2 + 75kg*1.6m/s2) What I do not understand is why I need to add the two positive forces. I was trying to draw a few body diagram. What I was picturing: two force vectors in opposite direction. So the magnitude would result in 45N if this were the case. Thanks in advance.