일반물리학 1 — Potential Energy and Conservation of Energy: Problem 46

46 An outfielder throws a baseball with an initial speed of 83.2 mi/h. Just before an infielder catches the ball at the same level, the ball’s speed is 110 ft/s. In foot-pounds, by how much is the mechanical energy of the ball–Earth system reduced because of air drag? (The weight of a baseball is 9.0 oz.)