A 15.0 kg. model plane flies horizontally at 12.5m/s. Part a) asks for kinetic energy. I got 1172J. Part b) says the plane goes into a power dive and levels off 20.4 m closer to the earth. How much energy did it lose during the dive. I got 2998.8J. Doesn't really make sense.
Then part c) asks how much kinetic energy did the plane gain during the dive. I'm lost. Please help.