how do you do heat energy questions? is it the energy lost? An unpowered 1600 kg object has an upward velocity of 7.0 x 10^3 m s at an altitude of 100 km above the earth. The object reaches a maximum altitude of 400 km. Earth 100 km 400 km v = 7.0 × 10^3 m s What is the heat energy generated during the object’s increase in altitude from 100 km to 400 km? A. 3.3 x 10^10 J B. 3.4 x 10^10 J C. 3.5 x 10^10 J D. 5.5 x 10^10 J this is from a sample exam, my teacher didnt teach us any of it. I used EP= Gm1m2/(r^2) for each position, and ek = .5 mv^2 and subtracted the two and got a totally wrong answer.... Please help me.