Calculating heat energy.... Q. #1 A 16 kg object is dropped from a height of 25 m and strikes the ground with a speed of 18 m/s. How much heat energy was produced during the fall? Choices A) 0 J B) 2 600 J C) 1 300 J D) 3 900 J Well,according to my calculation, the average acceleration was about 6.48m/s, which means 3.32N/kg acted as air friction. And I'm lost from there. Help will be greatly appreciated!