An airline executive decides to economize by reducing the energy, and thus the amount of fuel, required forlong distance flights. He orders the ground crew to remove the paint from the outer surface of each plane. The paint removed from a single plane has mass 100 kg. (a) If the airplane cruises at an elevation of 29000m, how much energy is saved in not having to lift the paint to that altitude? (b) How much energy is saved per airplane by not having to move the amount of paint from rest to a cruising speed of 230m/s? I tried these and got 56.84MJ and 31.07MJ, but these are not right. I used the equation E=K+U. I solved for K and then for U, but it's not right. Any suggestions? Thanks.