1. The problem statement, all variables and given/known data A spacecraft of mass m0 is descending with velocity v0 to land on an alien plant where the value of g is 1/6 of g on the earth. In order to land safely (meaning the final velocity upon landing is zero), fuel has to be burnt at a constant rate dm/dt=-k, where k is a constant. How far above the surface of the planet should one begin firing the spacecraft (assume constant deceleration) 2. Relevant equations m = m0 - kt 3. The attempt at a solution I am trying to use my knowledge of rocket motion. But i am having a hard time picturing the problem. Any comment/help will be great.