Can't really figure out where to start. Any help would be appreciated. 1. The problem statement, all variables and given/known data A 575 kg satellite is in a circular orbit at an altitude of 550 km above the Earth's surface. Because of air friction, the satellite eventually falls to the Earth's surface, where it hits the ground with a speed of 2.10 km/s. How much energy was transformed to internal energy by means of friction? 2. Relevant equations E = -1/2 G Ms Me / r v = 2 pi r / T E = - G Me Ms / Re + d M = mass R = radius 3. The attempt at a solution ok so 575kg, 550000 m above earths surface, falls at 2100 m/s 5.97 x 10^24 kg is earths mass (Me) 6378100 for earth radius (Re) Ms is mass of satelite G is constant so for Ek = 1/2mv^2 = 0.5*575*2100^2 = 1267875 kJ E = - G Me Ms / Re + d = (6.67 x 10^-11)(5.97 x 10^24)(575) / (6378100 + 550000) = -3.305 x 10^10 so do I substract E in orbit by Ek at crash (E - Ek)??