1. The problem statement, all variables and given/known data A 1500 kg plane, initially at rest, leaves an airfield and a short time later it is at an elevation of 3200 m travelling at 65 m/s. What is the minimum work done by the plane's engine in this time? (Ignore air resistance) 2. Relevant equations W=Fd, F=ma, and most certainly some other ones. 3. The attempt at a solution This is what I understand from the question: Vox = 0 m/s Voy = 0 m/s dy = 3200 m m = 1500 kg I assume that at 3200m, the plane starts to fly only horizontally, so "65 m/s" would be Vfx. The problem is that this seems insufficient for any of the kinematics formulas, and I don't see how I could use it in different areas (like dynamics). What am I missing here? Can someone please give me a push in the right direction? Any help is greatly appreciated, Thanks.