1. The problem statement, all variables and given/known data Using the PhETLunar Lander applet, we are to find the mass of the lunar lander. We know the maximum acceleration of the module's engines and gravitational acceleration of the moon. 2. Relevant equations F=ma mgh=1/2mv^2 f*t=p 3. The attempt at a solution Everytime I try to symbolically solve for the mass, the mass cancels out. I have tried using Newton's 2nd Law equations, conservation of energy, work-energy, and conservation of momentum. I can't seem to isolate mass on one side of an equation.